#  Heurck, Henri Ferdinand van (1838-1909) & Albert Grunow (1826-1914) 

 



 **Heurck**, Henri Ferdinand van (1838-1909) & Albert **Grunow** (1826-1914)  
**TYPES DU SYNOPSIS DES DIATOMEES DE BELGIQUE** ....   
Series I-XXII, numbers 1-550, 1882-1885.  
Specimens are strewn mounts on microscope slides. Index information was derived from microscope slide labels and the printed schedules of taxa and localities issued with the slide sets:  
 Types du Synopsis des Diatomées de Belgique par Dr. Henri Van Heurck. Déterminations, Notes et Diagnoses par M. A. Grunow. Série I-XXII. \[With 25 sldies per series.\]

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 *Amphora ovalis* Kützing  
France (Calvados) Falaise  
Van Heurck 1

 *Amphora affinis* Kützing  
Belgium (Brabant) Diegem; "Dieghem (Belgique)"  
Van Heurck 2

 *Amphora pediculus* (Kützing) Grunow f. *major*  
Poland (Silesia); "Silésie (Prusse)"  
Van Heurck 3

 *Amphora globosa* Schumann var. *perpusilla* Grunow  
*Amphora pediculus* var. *exilis*  
*Amphora perpusilla* Grunow  
Wales (West Glamorgan) Swansea; "Swansea (Angleterre)"  
Van Heurck 4

 *Amphora humicola* Grunow  
*Amphora normanni* Gregory  
Belgium (Brabant) Bruxelles  
Van Heurck 5

 *Amphora lineolata* Ehrenberg f. *minor*  
*Navicula salinarum*  
England (Humberside) Kingston-upon-Hull; "Humber à Hull (Angleterre)"  
Van Heurck 6

 A*chnanthes subsessilis* \[as "*Achnantes*"\]  
*Amphora affinisAmphora commutata* Grunow  
*Cyclotella kuetzingianaEpithemia gibba* var. *ventricosa*  
*Epithemia zebra*  
*Navicula interrupta* Kützing  
*Navicula sculptaNitzschia apiculataNitzschia hungaricaNitzschia navicularisNitzschia paradoxaNitzschia sigmoideaPleurosigma angulatumPleurosigma elongatumPleurosigma fasciolaPleurosigma strigilisSurirella ovataSurirella striatula*  
*Synedra affinis* var. \[unnamed\]  
*Synedra pulchella*  
England (Norfolk) Breydon; "(Angleterre)" Water  
Van Heurck 7

 *Amphora laevissima* Gregory  
*Amphora lineolata* Ehrenberg var. \[unnamed\]  
*Amphora plicata* Gregory  
*Navicula arenaria* Donkin  
*Plagiotropis gibberula*  
*Plagiotropis vitrea* var. \[unnamed\]  
*Pleurosigma aestuarii*  
England (Northumberland) Blyth; "(Angleterre)"Sand  
Van Heurck 8

 *Amphora angularis* var. *hybrida*  
*Amphora hians* Flögel  
*Amphora hybrida* Grunow  
*Amphora laevissima*  
*Amphora laevissima* var. *perminuta* Grunow  
*Hantzschia hyalina* Grunow  
*Navicula pygmaea* Kützing  
*Navicula salinarum*  
*Nitzschia sigma* var. \[unnamed\]  
*Stauroneis spicula* Hickie  
Wales (West Glamorgan) Swansea Dock; "(Angleterre)"  
Van Heurck 9

 *Amphora veneta* Kützing f. *minor*  
*Epithemia zebraGomphonema acuminatumGomphonema constrictumGomphonema* \[sp\]  
*Navicula radiosaNitzschia amphibiaNitzschia paleacea*  
*Nitzschia paradoxa*  
*Nitzschia subtilis* var. \[unnamed\]  
Belgium (West-Vlaanderen) Blankenberge; "Marècage saumâtre à Blankenberghe (Belgique)"  
Van Heurck 10

 *Achnanthes biasolettiana* var. *sublinearis* Grunow  
*Achnanthes delicatula* (Kützing) Grunow  
*Amphiprora alata*  
*Amphora incurva Gregory*  
*Amphora lineolata* Ehrenberg f. *minor*  
*Amphora salin*a W. Smith  
*Cyclotella meneghiniana*  
*Cyclotella meneghiniana* var. *pumila* Grunow  
*Eupodiscus weissflogi*i Grunow  
*Micropodiscus weissflogii* Grunow  
*Navicula ammophila* Grunow  
*Navicula pygmaea* Kützing  
*Navicula salinarum* Grunow  
Belgium (Antwerpen) Antwerp; "Saumâtre à Anvers (Belgique)"  
Van Heurck 11

 *Amphora angularis* Gregory var. *hybrida* Grunow  
*Amphora* \[cf.\] *coffeaeformis*  
*Amphora hybrida* Grunow  
*Amphora salina*  
*Cocconeis placentula* var. \[unnamed\]  
*Cymbella pusilla*  
*Epithemia constricta*  
*Epithemia gibba* var. *ventricosa*  
*Navicula cincta*  
*Navicula halophila* Grunow  
*Navicula neglectum* var. \[unnamed\]  
*Nitzschia apiculata*  
*Nitzschia frustulum* var. *perminta*  
*Nitzschia hungarica*  
*Nitzschia microcep*hala Grunow  
*Nitzschia obtusa* var. *minor*  
*Raphoneis surirella*  
*Schizonema neglectum* var. \[unnamed\]  
*Surirella ovata*  
*Synedra affinis*  
*Synedra pulchella*  
Belgium (West-Vlaanderen) Blankenberge; "Saumâtre à Blankenberhe (Belgique)"  
Van Heurck 12

 *Amphora arenaria* Donkin  
*Amphora decipiens* Grunow  
*Amphora lineata* Gregory var. \[unnamed\]  
*Amphora macilenta* \[cf.\]  
*Amphora taylorii* Grunow  
*Amphoropsis decipiens* Grunow  
*Anorthoneis excentrica*  
*Cocconeis excentrica*  
*Druridgea geminata*  
*Epithemia marina Donkin*  
> *Hantzschia amphioxys*  
*Hantzschia amphioxys* var. *vivax*  
*Hantzschia marin*a Donkin  
*Hantzschia viva*x (Hantzsch) Grunow  
*Hantzschia vivax* *nec,* \[cf.\] W. Smith  
*Navicula lineata* Donkin  
*Navicula northumbrica* Donkin  
*Navicula palpebralis* var. \[unnamed\]  
*Podosira pumila* Brébisson  
England (Northumberland) Tynemouth; "(Angleterre)"  
Van Heurck 13

 *Cymbella ehrenbergii* Kützing f. *major*  
*Cymbella gastroides*  
*Navicula major*  
*Navicula viridis*  
Germany (Leipzig) Leipzig; "Allemagne"  
Van Heurck 14

 *Cymbella ehrenbergii* Kützing  
*Epithemia gibbaNavicula oblongaNitzschia sigmoideaNitzschia vermicularis* f. \[unnamed\], \["angustior"\]  
*Pleurosigma acuminatum* Kützing  
*Synedra splendens*  
Belgium (Antwerpen) Antwerp; "Anvers, Belgique"  
Van Heurck 15

 *Cymbella cuspidata* Kützing  
*Epithemia sorex*  
*Gomphonema clavatum* Ehrenberg  
*Orthosira tenuis*  
*Stephanodiscus astraea* var. *mintula*  
*Stephanodiscus minutula*  
Synedra splendens var. \[unnamed\]  
Germany (Niedersachsen) Oberohe; "Dépot fossile (Kieselguhr) d'Oberohe près Lunebourg, Allemagne"  
Van Heurck 16

 *Cymbella angustat*a W. Smith  
*Cymbella cuspidata* Kützing var. *obtusiuscula* Grunowr  
*Eunotia lunaris*  
*Fragilaria virescens* \[as "*Fragillaria*"\]  
*Gomphonema parvulum* var. *exilissima*  
*Gomphonema parvulum* var. *subcapitata*  
*Hantzschia amphioxys*  
*Navicula angustata* W. Smith  
*Stauroneis platalea* Ehrenberg  
*Surirella angusta*  
*Surirella gracilis* Grunow  
*Surirella minuta*  
*Surirella moelleri* Grunow \[as "Mölleri"\]  
*Tabellaria fenestrata*  
*Tabellaria flocculosa*  
Wales (Dyfed) Carmarthen; "(Angleterre)"  
Van Heurck 17

 *Cocconeis pediculus*  
*Cymbella lanceolata* (Ehrenberg) \[Van Heurck\]  
*Gomphonema acuminatum*  
*Synedra longissima* var. *longissima*  
*Synedra ulna*  
Austria (Wien) Wien; "Vienne (Autriche)"  
Van Heurck 18

 *Cymbella amphicephala* Nägeli  
*Cymbella cymbiformis*  
*Cymbella cymbiformis* var. \[unnamed\]  
*Cymbella parva* W. Smith  
*Cymbella tumidula* Grunow  
*Gomphonema angustatum*  
*Gomphonema subclavatum*  
*Synedra splendens* vars. \[unnamed\]  
England (Wiltshire) Devizes; "(Angleterre)"  
Van Heurck 19

 *Cymbella gastroides* Kützing f. *major*  
*Navicula major* Kützing  
Germany (Schleswig-Holstein) Wedel; "Wedel (Holstein)" \[on printed listing\]  
Van Heurck 20

 *Cymbella gastroides* Kützing  
Great Britain; "Angleterre" \[on the slide label}  
Van Heurck 20

 *Cymbella tumida* (Brébisson) \[Van Heurck\]  
Sweden; "Suède"  
Van Heurck 21

 *Cymbella cymbiformis* Ehrenberg f. *minor*  
Scotland (Fife) Kinghorn; "Kinghorn, (Angleterre)"  
Van Heurck 22

 *Cocconema parva* \[W.\] Smith  
*Cymbella affinis* var. *gracilis* Grunow  
*Cymbella cymbiformi*s var. *parva*  
*Cymbella cymbiformis* \[cf.\]  
Cymbella parva \[W.\] Smith  
Scotland (Strathyclyde) Ardeer; "Ardeep Quarry (Angleterre)"  
Van Heurck 23

 *Cymbella cistula* Hemprich  
*Cymbella lanceolata*  
*Cymbella tumida* (Brébisson) \[Van Heurck\]  
*Gomphonema acuminatum* var. *trigonocephala*  
*Gomphonema constrictum* vars. \[unnamed\]  
*Navicula radiosa*  
*Synedra pulchella* var. \[unnamed\]  
*Synedra splendens* var. \[unnamed\]  
*Synedra* spp.  
Germany (Schleswig-Holstein) Wedel; "Wedel (Holstein)"  
Van Heurck 24

 *Amphora ovalis*  
*Cocconeis placentula* var. \[unnamed\]  
*Cymatopleura elliptica*  
*Cymatopleura solea*  
*Cymbella cistula* var. *cistula* Grunow  
*Epithemia sorex*  
*Epithemia zebra*  
*Fragilaria capcuin*a var. *mesolepta*  
*Fragilaria intermediaGomphonema constrictum* var. *capitata*  
*Gomphonema parvulum*  
*Navicula cryptocephala*  
*Pleurosigma spencerii*  
*Staurosira intermedia*  
*Synedra splendens* var. *subspathulata* Grunow  
Belgium (Antwerpen) Deurne; "Deurne près Anvers (Belgique)"  
Van Heurck 25

 *Cymbella affinis* Kützing  
*Cymbella cymbiformis* var. *parva*  
*Cymbella parva*  
*Cymbella salinarum* Grunow  
Italy; "Italie"  
Van Heurck 26

 *Cymbella affinis* var. *tumidula*  
*Cymbella affinis* \[cf.\]  
*Cymbella amphicephala* var. *tumidula* Grunow  
*Cymbella amphicephala* \[cf.\]  
*Cymbella helvetica* var. *abbreviata* Grunow  
*Cymbella helvetica* \[cf.\]  
*Cymbella maculata* Brébisson  
*Cymbella maculata* \[nec Kützing  
*Cymbella salinarum* Grunow \[cf.\]  
*Cymbella tumidula* Grunow  
*Cymbella turgidula* Cleve & Möller \[cf.  
*Cymbella turgidula* Grunow  
*Navicula radiosa*  
*Navicula elliptica* var. *oblongella*  
England (Oxfordshire) Oxford; "Oxford (Angleterre)"  
Van Heurck 27

 *Cymbella rupicola* Grunow  
*Diatomella balfouriana*  
*Navicula tabida* Rylands  
*Navicula zellensis* Grunow  
Scotland (Tayside) Ben Lawers; "Ben Lawers (Angleterre)"  
Van Heurck 28

 *Cyclotella kuetzingianaCymbella amphicephalaCymbella cistulaCymbella helveticaCymbella subaequalis* Grunow  
*Navicula radiosaNitzschia denticulaStauroneis brevistriata* var. *subcapitata*  
*Staurosira elliptica*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 29

 *Achnanthes trinodis* (Arnott) Grunow  
*Cymbella incerta* Grunow  
*Cymbella scotica* \[cf.\]  
*Cymbella subaequalis* var. *incerta* Grunow  
*Epithemia gibbaEpithemia ocellataEpithemia zebraNavicula ellipticaNavicula exilis* \[cf.\]  
*Navicula trinodis* W. Smith  
*Synedra amphicephala* Kützing var. \[unnamed\]  
*Synedra fontinalis* W. Smith \[cf.\]  
Scotland (Strathclyde) Gourock; "Gourock (Angleterre)"  
Van Heurck 30

 *Cymbella delicatula* Kützing  
*Gomphonema intricatum* var. *pumila* Grunow  
Belgium (Luxembourg) Frahan; "Frahan (Belgique)"  
Van Heurck 31

 *Cymbella helvetica* Kützing  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 32

 *Asterionella formosaCymbella affinisCymbella helvetica* var. *abbreviata* Grunow  
*Cymbella norvegicaEncyonema norvegicum* Grunow  
*Encyonema ventricosum* (Kützing) \[Van Heurck\]  
*Navicula avenacea* (Brébisson) W. Smith  
*Navicula viridula* var. *avenacea*  
Scotland (Lothian) Pentland Hills; "Pentland Hills (Angleterre)"  
Van Heurck 33

 *Colletonema neglectum* Thwaites  
*Encyonema prostratum* Ralfs  
England (Yorkshire) Parklengton\[?\]' "Paklengton, Yorkshire (Angleterre)"  
Van Heurck 34

 *Encyonema caespitosum* Kützing  
England (Cheshire); "Cheshire (Angleterre)"  
Van Heurck 35

 *Achnanthes lanceolata*  
*Encyonema ventricosum* (Kützing) Grunow f. *major*  
*Navicula viridula*  
*Nitzschia perpusilla* Rabenhorst  
*Staurosira elliptica*  
France (Calvados) Falaise; "Normandie (France)"  
Van Heurck 36

 *Cymbella affinis* Kützing  
*Encyonema ventricosum* (Kützing) Grunow f. *media*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 37

 *Encyonema ventricosu*m (Kützing) Grunow f. *minuta*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)  
Van Heurck 38

 *Cymbella lunata* W. Smith  
*Cymbella microcephala*  
*Encyonema gracile* var. *lunata* W. Smith  
*Eunotia exigua* var. *perpusilla* Grunow  
*Eunotia gracilis* (Ehrenberg) W. Smith  
*Eunotia impressa* Ehrenberg var. *angustata*  
*Eunotia incisa*  
*Eunotia lunaris* forms \[unnamed\]  
*Eunotia lunaris* var. *perminuta*  
*Eunotia monodon*  
*Eunotia triodon*  
*Navicula angusta* Grunow  
*Navicula brachysira* Brébisson \[cf.\]  
*Navicula cocconeiformis*  
*Navicula hilseana* Janisch  
*Navicula microcephala*  
*Navicula serians* var. *minima* Grunow  
*Navicula viridis* var. *commutata*  
*Nitzschia perpusilla* Rabenhorst  
*Tabellaria flocculosa*  
*Vanheurckia crassinervia*  
Scotland (Grampian) Braemar; "Braemar (Angleterre)"  
Van Heurck 39

 *Nitzschia linearis*  
*Nitzschia sigmoidea*  
*Stauroneis phoenicenteron* Ehrenberg f. *major*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 40

 *Cymbella amphicephala* Nägeli  
*Navicula brebissonii* var. *subproducta*  
*Stauroneis gracilis* Ehrenberg  
Wales (Dyfed) Carmarthen; "Caermarthen (Angleterre)"  
Van Heurck 41

 *Amphora ovalis*  
*Nitzschia sigmoidea*  
*Stauroneis acuta* W. Smith  
England (Warwickshire) Warwick; "Warwich\[!\] (Angleterre)"  
Van Heurck 42

 *Achnanthes lanceolata*  
*Gomphonema insigne*  
*Meridion circulare*  
*Meridion circulare* var. *constricta*  
*Navicula dicephala* Kützing  
*Navicula radiosa* Kützing  
*Navicula viridula* Kützing var. *slesvicensis*  
*Nitzschia linearis* var. *tenuis*  
*Stauroneis anceps* Ehrenberg  
*Synedra acus* Kützing var. \[unnamed\]  
England (\[?\]) Springhead Hill; "Hattenprice près Springhead Hill (Angleterre)"\]  
Van Heurck 43

 *Amphiprora alata*  
*Nitzschia acuminata*  
*Nitzschia apiculata*  
*Nitzschia punctata*  
*Nitzschia rigida* Grunow  
*Nitzschia sigma* var. *rigida* Grunow  
*Nitzschia sigma* var. \[unnamed\]  
*Pleurosigma angulatum*  
*Pleurosigma elongatum*  
*Scoliopleura tumida*  
*Stauroneis salina* W. Smith  
*Surirella gemma*  
*Surirella ovata*  
England (Lancashire) Lancaster; "Ecume d'un étang salè à Lancaster (Angleterre)  
Van Heurck 44

 *Cymatopleura apiculat*a  
*Cymbella amphicephala* Nägeli  
*Navicula limosa* var. \[unnamed\]  
*Stauroneis anceps*  
*Stauroneis smithii* Grunow  
Scotland (Central) Airthey Castle; "Source au dessus d'Airthrey Castle (Angleterre)"  
Van Heurck 45

 *Epithemia gibberul*a var. \[unnamed\]  
*Epithemia succincta* \[cf.\]  
*Mastogloia danse*i  
*Mastogloia smithii* Thwaites  
South Africa; "Afrique mériodinale"  
Van Heurck 46

 *Cymbella cesatii*  
*Epithemia argus* Kützing  
*Epithemia gibba*  
*Mastogloia dansei*  
*Mastogloia lacustris* Grunow  
*Mastogloia smithii* var. \[unnamed\]  
*Navicula cesatii*  
*Synedra capitata*  
Belgium (Brabant) Bergh; "Bergh (Brabant, Belgique)"  
Van Heurck 47

 *Cymbella gastroides* var. \[unnamed\]  
*Cymbella helvetica* var. \[unnamed\]  
*Cymbella obtusa* Gregory \["genuina!"\]  
*Denticula elegans* Kützing  
*Epithemia gibba*  
*Epithemia gibberula* var. *rupestris*  
*Epithemia zebra*  
*Mastogloia grevillei* W. Smith  
*Mastogloia lacustris* Grunow  
*Mastogloia smithii* var. *lacustris*  
*Navicula elliptica*  
*Navicula rupestris*  
*Navicula undulata* Gregory  
*Navicula viridis* var. \[unnamed\]  
*Nitzschia sinuata* W. Smith  
England (\[?\]) Gill Banks; "Gills Banks, Ulverstone (Angleterre)"  
Van Heurck 48

 *Achnanthes brevipes*  
*Hyalodiscus scoticus*  
*Mastogloia braunii* Grunow var. \[unnamed\]  
*Mastogloia dansei* Thwaites  
*Melosira sulcata*  
*Navicula smithii*  
Germany (Rostock) Rugen, Baltic Sea; "Ile de Rügen, mer Baltique"  
Van Heurck 49

 *Achnanthes brevipes*  
*Epithemia musculus*  
*Mastogloia exigua* Lewis  
*Synedra tenera* W. Smith var. \[unnamed\]  
Scotland (Strathclyde) The Cumbraes; "Cumbrae (Angleterre)"  
Van Heurck 50

 *Eunotia majo*r  
*Eunotia tetraodon*  
*Navicula alpina*  
*Navicula dactylus* Ehrenberg  
*Navicula divergens*  
*Navicula major*  
*Navicula viridis* var. \[unnamed\]  
Scotland (Grampian) Premnay; "Premnay Peat (Angleterre)"  
Van Heurck 51

 *Navicula nobilis* Ehrenberg  
Poland (Silesia); "Silésie"  
Van Heurck 52

 *Cymbella gastroides*  
*Navicula cardinalis*  
*Navicula dactylus*  
*Navicula gentilis* Donkin  
*Navicula viridis*  
England (Norfolk); "Norfolk (Angleterre)"  
Van Heurck 53

 *Navicula major* Kützing  
*Synedra capitata*  
Belgium (Brabant) Bruxelles; "Bruxelles, Belgique"  
Van Heurck 54

 *Navicula integra*  
*Navicula major* Kützing var. \[unnamed\]  
*Navicula viridis*  
Great Britain; "Angleterre"  
Van Heurck 55

 *Navicula viridis* Kützing  
Scotland (Strathclyde) Greenock; "Greenrock\[!\], Angleterre"  
Van Heurck 56

 *Navicula viridis*  
*Navicula viridis* var. *commutata* Grunow  
*Nitzschia linearis*  
*Nitzschia viridis* \[cf.\]  
Great Britain; "Angleterre" \[on slide label\]  
Belgium (Antwerpen) St. Laurent; "St-Laurent près d'Anvers, Belgique" \[on printed card listing\]  
Van Heurck 57

 *Navicula brebissonii* Kützing  
*Navicula heufleri* f. *minuta*  
*Surirella angustata* var. \[unnamed\]  
*Surirella minuta*  
Belgium (Brabant) Laeken; "Laeken, Belgique"  
Van Heurck 58

 *Navicula amphisbaena*  
*Navicula anglica* f. *minor*  
*Navicula brebissonii* var. *bicuneata* Grunow  
*Navicula brebissonii* \["typica"\]  
*Navicula viridis* var. *commutata*  
Ireland (Cork) Kurck; "Kurck, Comté de Corck, Angleterre"\[as "Angletere" on printed cards\]  
Van Heurck 59

 *Navicula cardinalis* Ehrenberg  
*Navicula major*  
*Nitzschia linearis*  
*Nitzschia sigmoidea*  
Belgium (Brabant) Bruxelles; "Bruxelles, Belgique"  
Van Heurck 60

 *Navicula lata* Brébisson  
France (Orne) Guilberdière; "Guilberdière près Falaise, France"  
Van Heurck 61

 *Diadesmis flotowiana* Grunow  
*Eunotia praerupta* var. *bigibba*  
*Melosira dickiei*  
*Melosira roeseana*  
*Navicula borealis* Kützing  
*Navicula flotowian*a Grunow  
*Surirella tenera* Gregory f. *minuta*  
Belgium (Luxembourg) Frahan; "Frahan, Belgique"  
Van Heurck 62

 *Diadesmis contenta*  
*Melosira dickiei*  
*Melosira roeseana*  
*Navicula borealis*  
*Navicula contenta* Grunow  
*Navicula lata* var. *minor* Gregory  
*Navicula lata* \[cf.\]  
*Navicula rabenhorstii* Grunow  
*Navicula trinodis*  
*Navicula* \[sp  
Belgium (Luxembourg) Frahan; "Frahan Belgique"  
Van Heurck 63

 *Navicula bicapitata* var. *stauroneiformis* f. *minor*  
*Navicula gibba* Ehrenberg f. *minor*  
Germany (Dresden) Dresden; "Dresde"  
Van Heurck 64

 *Navicula acrosphaeria* Brébisson \[nec\] Kützing  
*Navicula acrosphaeria* W. Smith \[nec?\]  
*Navicula gibba* Ehrenberg var. *acrosphaeria*  
France (Calvados) Falaise; "Falaise, France"  
Van Heurck 65

 *Navicula cuneata* O'Meara \[cf.\]  
*Navicula sudetica* Hilse var. *brittanica* Grunow  
England (Devon) Great Haldon; "Haldon près Teignmouth, Angleterre"  
Van Heurck 66

 *Cymbella aequalis* W. Smith  
*Cymbella aequalis* W. Smith f. *minor* *Eunotia exigua* var. \[unnamed\]  
*Eunotia pectinali*s var. *undulata*  
*Navicula affinis*  
*Navicula amphigomphus*  
*Navicula bicapitata* Lagerstedt var. \[unnamed\]  
*Navicula firma* Kützing  
*Navicula gibba* \["genuina\]"  
*Navicula gibba* var. *acrosphaeri*a Brèbisson  
*Navicula viridis* var. *firma* Kützing  
*Peronia erinacea* Brébisson  
*Pinnularia biceps* Gregory  
*Stauroneis amphicephala* Kützing  
*Stauroneis phoenicenteron*  
*Stauroneis smithii* Grunow  
*Tabellaria flocculosa*  
Wales (Dyfed) Haverfordwest; "Havorfordwest, Angleterre"  
Van Heurck 67

 *Navicula brebissonii*  
*Navicula mesolepta* Ehrenberg  
*Nitzschia linearis* var. *tenuis* Grunow  
Germany (Schleswig-Holstein) Wilhelmshütte; "Wilhelmshütte, Allemagne"  
Van Heurck 68

 *Epithemia gibba*  
*Epithemia zebra*  
*Navicula legumen* Ehrenberg f. *major*  
*Navicula limosa*  
*Navicula unda*ta A. Schmidt  
*Navicula viridis*  
*Nitzschia linearis*  
Belgium (Luxembourg) Laviot; "Laviot, Belgique"  
Van Heurck 69

 *Navicula humilis* Donkin  
Belgium (Brabant) St-Josse-ten-Noode; "St-Josse-ten-Noode, Bruxelles (Belgique)"  
Van Heurck 70

 *Navicula binodis* W. Smith  
*Navicula costulata* Grunow  
*Navicula cyprinus* (Ehrenberg) W. Smith  
*Navicula digitoradiata* var. *striolata* Grunow  
*Navicula digitoradiata* Gregory \[cf.\]  
*Navicula exigua* Gregory  
*Navicula gastru*m var. *exigua*  
*Navicula humilis* Donkin  
*Navicula menisculus* Schumann var. \[unnamed\]  
*Navicula reinhardti*i Grunow \[cf.\] \[as "reinhardti"\]  
*Navicula reinhardtii* var. *gracilior* Grunow  
*Stauroneis smithii* Grunow  
Belgium (Brabant) Rouge-Cloître; "Rouge-Cloître, Belgique"  
Van Heurck 71

 *Navicula trevelyana* Donkin  
Belgium; "Belgique" \[on printed cards\]  
Great Britain; "Angleterre" \[on slide label\]  
Van Heurck 72

 *Navicula cancellata* Donkin  
Great Britain; "Angleterre"  
Van Heurck 73

 *Actinoptychus undulatus*  
*Amphiprora didyma*  
*Amphiprora lepidoptera* var. \[unnamed\]  
*Amphora belgica* Grunow  
*Amphora ostrearia*  
*Amphora ostrearia* var. *belgica*  
*Auliscus sculptus*  
*Campylosira cymbelliformis* Grunow  
*Coscinodiscus radiatus*  
*Cymatosira belgica*  
*Hantzschia marina*  
*Hantzschia virgata*  
*Hyalodiscus stelliger* J.W. Bailey  
*Lithodesmium undulatum*  
*Navicula angularis*  
*Navicula cancellata* Donkin \[cf.\]  
*Navicula clepsydr*a \[cf\].  
*Navicula cruciformis* Donkin  
*Navicula granulat*a  
*Navicula humerosa*  
*Navicula lyra* var. \[unnamed\]  
*Navicula pectinali*s Brébisson  
*Navicula rectangula* Gregory  
*Navicula retusa* Brébisson \[cf.\]  
*Navicula subretus*a Grunow  
*Navicula trevelyana*  
*Nitzschia spathulata*  
*Nitzschia thermalis* var. *littoralis*  
*Odontella aurita* var. *minima*  
*Odontella rhombus*  
*Pleurosigma delicatulum*  
*Raphoneis amphiceros*  
*Raphoneis belgica*  
*Raphoneis surirella* Grunow  
*Stauroneis gregorii* (Ralfs) \[Van Heurck\]  
*Triceratium favu*s  
Belgium (West-Vlaanderen)Blankenberge; "Lavage de sable de la Plage à Blankenberghe, Belgique"  
Van Heurck 74

 *Epithemia argus*  
*Mastogloia lacustris* Grunow  
*Mastogloia smithii* var. *lacustris*  
*Mastogloia* spp.  
*Melosira arenaria*  
*Navicula hebes* Ralfs  
*Navicula oblonga*  
*Nitzschia denticula* Grunow  
Great Britain; "Angleterre"  
Van Heurck 75

 *Navicula affinis*  
*Navicula firma* Kützing f. *minima*  
*Navicula iridis* var. *firma*  
*Navicula oblonga* Kützing  
*Navicula sphaerophora* Kützing  
Belgium (Brabant) La Hulpe; ":La Hulpe, (Belg.)"  
Van Heurck 76

 *Navicula elegans* W. Smith  
*Navicula peregrin*a Kützing  
*Navicula pygmaea* Kützing  
*Nitzschia palea* var. \[unnamed\]  
Wales (Dyfed) Haverfordwest; "Havorfordwest, (Angleterre)"  
Van Heurck 77

 *Amphiprora vitre*a W. Smith  
*Navicula cyprinus* W. Smith  
*Navicula rostellat*a Kützing var. \[unnamed\]  
*Nitzschia sigma* \["genuina"\]  
*Plagiotropis vitrea* W. Smith  
*Pleurosigma aestuarii*  
*Stauroneis gregorii* Ralfs  
*Stauroneis salinaStauroneis salina* var. \[unnamed\]  
Wales (Dyfed) Neyland; "Neyland, (Angleterre)"  
Van Heurck 78

 *Cymbella amphicephala*  
*Navicula affinis*  
*Navicula amphisbaena*  
*Navicula binodis*  
*Navicula dubia* (Ehrenberg) Gregory  
*Navicula humilis*  
*Navicula lanceolata*  
*Navicula limosa*  
*Navicula menisculus* var. \[unnamed\]  
*Navicula rheinhardtii* Grunow  
*Nitzschia linearis*  
*Nitzschia recta*  
*Vanheurckia vulgaris* (Thwaites) Van Heurck  
Belgium (Brabant) La Hulpe; La Hulpe, (Belgique)"  
Van Heurck 79

 *Navicula anglica*  
*Navicula binodis*  
*Navicula costulata* Grunow  
*Navicula exigua* Gregory  
*Navicula humilis*  
*Navicula menisculus* Schumann f. *parva*  
*Navicula reinhardtii* Grunow var. *gracilior*  
*Nitzschia linearis*  
*Nitzschia pale*a var. \[unnamed\]  
*Stauroneis smithii*  
Vanheurckia vulgaris (Thwaites)Van Heurck  
Belgium (Brabant) Rouge-Cloître; "Rouge-Cloître (Belgique)"  
Van Heurck 80

 *Achnanthes lanceolata*  
*Cocconeis pediculus*  
*Cocconeis placentula*  
*Colletonema neglectum* Thwaites  
*Meridion circulare*  
*Navicula gracilis* Kützing  
England (\[?\]) Gill Banks\[?\], Ulverstone; "Gills Banks, Ulverstone, (Angleterre)"  
Van Heurck 81

 *Achnanthes lanceolata*  
*Achnanthes lanceolata* forms \[unnamed\]  
*Melosira crenulata* var. a*mbigua* Grunow  
*Melosira crenulata* var. tenuis (Kützing)  
*Navicula atomoides* Grunow  
*Navicula cincta* Ehrenberg \[on slide label\]  
*Synedra minuscula* Grunow  
Czechoslovakia (Zapedocesky) Frantiskovy-Lazne; "Franzenbad (Bohême)" \[on printed card listing\]  
Great Britain; "Angleterre" \[on slide label\]  
Van Heurck 82

 *Navicula angusta*  
*Navicula cincta* f. *minuta*  
*Navicula gregaria* Donkin \[cf.\]  
*Navicula phyllept*a Kützing f. *minor*  
*Pleurosigma spenceri* var. *curvula* Grunow  
Belgium (West-Vlaanderen) Oostende; "Ostende, (Belgique)"  
Van Heurck 83

 *Navicula amphisbaena*  
*Navicula cincta* Ehrenberg var. *leptocephala* Brèbisson  
Belgium; "Belgique"  
Van Heurck 84

 *Navicula radiosa* Kützing  
Belgium (Brabant) Rouge-Cloître; "Rouge-Cloître, (Belgique)"  
Van Heurck 85

 *Navicula acuta* W. Smith  
*Navicula gibba* var. \[unnamed\]  
*Navicula limosa* vars. \[unnamed\]  
*Navicula radiosa* Kützing var. acuta  
Belgium<; "Belgique" \[on slide label only\]  
Van Heurck 86

 *Navicula rostellata* Kützing  
India (West Bengal); "Bengale"  
Van Heurck 87

 *Navicula avenacea* Brébisson  
*Navicula viridula* Kützing var. *avenacea* Brèbisson  
Belgium (Brabant) Schaerbeck; "Schaerbeeck, (Belgique)"  
Van Heurck 88

 *Navicula cuspidata* var. *halophila*  
*Navicula viridula* var. s*lesvicensis* Grunow  
*Nitzschia calida* \[cf.\]  
*Nitzschia commutata* Grunow  
*Nitzschia hybrida* Grunow \[cf.\]  
*Nitzschia normanni* Grunow  
*Surirella ovalis*  
*Surirella ovat*a  
England (Humberside) Stoneferry; "Stoneferry près Hull (Angleterre)"  
Van Heurck 89

 *Cyclotella comta* Ehrenberg var. \[unnamed\]  
*Cymatopleura solea*  
*Navicula amphisbaena*  
*Navicula cuspidata*  
*Navicula radiosa*  
*Navicula rhynchocephala* Kützing \[as "*rynchocephala\]*"  
*Navicula viridis*  
Navicula viridula var. *slesvicensis* Grunow  
*Pleurosigma acuminatum* (Kützing) Grunow  
Scotland (Lothian) Duddingston Loch; "Duddington{\[!\] Loch, (Angleterre)"  
Van Heurck 90

 *Navicula bottnica* Grunow  
Wales (Dyfed) Haverfordwest; "Havorfordwest, (Angleterre)"  
Van Heurck 91

 *Melosira varians*  
*Navicula cryptocephala* Kützing var. *intermedia* Grunow  
*Navicula cryptocephala* W. Smith \[nec\]  
*Navicula viridula* Kützing var. \[unnamed\]  
England (Devon) Teignmouth; "Teignmouth (Angleterre)"  
Van Heurck 92

 *Navicula cryptocephala* Kützing var. *exilis* Grunow  
*Navicula exilis* Kützing  
*Navicula gregaria* \[cf.\]  
Belgium (Brabant) Laeken; "Laeken (Belgique)"  
Van Heurck 93

 *Amphora proteus* Gregory forms \[unnamed\]  
*Amphora salina* W. Smith  
*Druridgia geminata*  
*Hantzschia marina*  
*Navicula ammophila* Grunow  
*Navicula cancellata* var. *ammophila*  
*Navicula clepsydra* Donkin  
*Navicula granulata*  
*Navicula gregaria* Donkin  
*Navicula humerosa*  
*Navicula palpebralis*  
*Nitzschia spathulata*  
*Orthoneis excentrica*  
England (Northumberland) Creswell; "Creswell (Northumberland, Angleterre)"  
Van Heurck 94

 *Navicula pygmaea* Kützing  
*Navicula salinaru*m Grunow  
Germany (Schleswig-Holstein) Wedel; "Wedel, Holstein"  
Van Heurck 95

 *Navicula cryptocephala* var. *exilis* Grunow  
*Navicula humilis* Donkin  
*Navicula lanceolata* Kützing  
*Navicula lanceolata* W. Smith \[nec\]  
*Nitzschia palea*  
*Nitzschia recta* Hartmann  
*Nitzschia vermicularis* Kützing  
Great Britain; "Angleterre"  
Van Heurck 96

 *Navicula arenaria* Donkin  
*Pleurosigma aestuarii*  
England (Northumberland) Hudon Sands; "Hudon Sands (Northumberland, Angleterre)"  
Van Heurck 97

 *Cymbella gastroides*  
*Eunotia gracilis* Ehrenberg  
*Eunotia mondon*  
*Eunotia praerupta*  
*Gomphonema gracile* Ehrenberg  
*Melosira crenulata* var. \[unnamed\]  
*Navicula dactylus*  
*Navicula iridis* var. *amphigomphus*  
*Navicula major*  
*Navicula mutica*  
*Navicula seme*n W. Smith  
*Navicula viridis*  
*Nitzschia spectabilis*  
*Stauroneis acuta* var. *javanica*  
*Stauroneis acuta* var. *maxima*  
*Stauroneis phoenicenteron*  
Canada (Nova Scotia) North Mountains \[?\]; North mountains (Nouvelle-Ecosse)" \[on printed card listing\]  
Great Britain; "Angleterre" \[on slide label\]  
Van Heurck 98

 *Navicula anglica* var. *subcruciata* Grunow  
*Navicula brevipes* Gregory  
*Navicula clementis* Grunow  
*Navicula crucicula* var. *protracta*  
*Navicula exigua* Gregory \[cf.\]  
*Navicula hungarica* Grunow  
*Navicula protracta* Grunow  
*Pinnularia pygmae*a Ehrenberg  
*Surirella ovata* var. *patella* Ehrenberg  
England (Cheshire) Great Mols; "Great Mols (Cheshire, Angleterre)"  
Van Heurck 99

 *Navicula gregaria* Donkin  
*Navicula phyllepta* Kützing  
*Navicula phyllepta* Kützing forms \[unnamed\]  
*Nitzschia sigma* var. *diminuta*  
*Nitzschia sigma* var. *rigula*  
Belgium (West-Vlaanderen) Blankenberge; "Blankenberghe (Belgique)"  
Van Heurck 100

 *Amphora marina*  
*Cocconeis dirupta*  
*Cocconeis scutellum* var. *stauroneiformis*  
*Coscinodiscus radiatus*  
*Melosira sulcata*  
*Navicula aspera*  
*Navicula crabo* Ehrenberg  
*Navicula didyma*  
*Surirella fastuosa*  
Scotland (Strathclyde) Corrygills Point; "Carrieghills, Arran, (Angleterre)"  
Van Heurck 101

 *Achnanthes brevipes*  
*Amphiprora alata*  
*Melosira borreri*  
*Navicula didyma* Ehrenberg  
*Nitzschia navicularis*  
*Nitzschia sigma* var. *genuina*  
*Synedra tabulata*  
Great Britain; "Angleterre"  
Van Heurck 102

 *Mastogloia dansei* var. *elliptica*  
*Mastogloia elliptica* Grunow  
*Navicula constricta* Grunow  
*Navicula cyprinus* (Ehrenberg) W. Smith. \[cf.\]  
*Navicula didyma*  
*Navicula digitoradiata* Gregory \[as "digito-radiata"\]  
*Navicula donkinii* O'Meara  
*Navicula donkinii* A. Schmidt \[nec\]  
*Navicula fusca* Gregory  
*Navicula interrutpa* Kützing  
*Navicula musca* Donkin  
*Navicula musca* Gregory \[nec\]  
*Navicula peregrina* vars. \[unnamed\]  
*Nitzschia vitrea*  
*Scoliopleura tumida* (Brébisson) Rabenhorst  
England (Northumberland) Coquet River; "Coquet Mouth (Angleterre)"  
Van Heurck 103

 *Amphiprora lepidoptera*  
*Amphora cingulata* Cleve  
*Campylodiscus thuretii*  
*Hantzschia marina*  
*Navicula aestiva* Donkin  
*Navicula apiculata* var. *crucifera*  
*Navicula apis* A. Schmidt  
*Navicula apis* Ehrenberg \[nec\]  
*Navicula apis* Donkin \[nec\]  
*Navicula aspera*  
*Navicula bombu*s Ehrenberg  
*Navicula cancellata* Donkin  
*Navicula chersonensis* var. *apiformis* Grunow  
*Navicula constricta* Grunow  
*Navicula crabro* var. *aspera*  
*Navicula didyma*  
*Navicula forcipata*  
*Navicula fusca* Gregory  
*Navicula liber* W. Smith  
*Navicula lineata* Donkin  
*Navicula littoralis* Donkin  
*Navicula palpebralis*  
*Navicula smithii*  
*Navicula smithii* Brébisson var. \[unnamed\]  
*Navicula splendida*  
*Plagiogramma gregorianum*  
Scotland (Strathclyde) The Cumbraes' "Lavage de sable marin de Cumbrae, (Angleterre)"  
Van Heurck 104

 *Epithemia musculus*  
*Navicula cyprinus* vars. \[unnamed\]  
*Navicula didyma*  
*Navicula digitoradiata*  
*Navicula formosa*  
*Navicula fusca* Gregory  
*Navicula interrupta* Kützing  
*Navicula smithii*  
*Navicula westii* W. Smith  
*Nitzschia sigma*  
*Nitzschia vitrea* Norman  
*Scoliopleura latestriata* (Brébisson) Rabenhorst  
*Scoliopleura tumida* (Brébisson) Rabenhorst  
*Scoliopleura wes*tii W. Smith  
England (Northumberland) Coquet River; "Coquet Mouth, (Angleterre)"  
Van Heurck 105

 *Amphora humicola*  
*Amphora normanni*  
*Navicula oculata* Brébisson  
*Nitzschia angustata* \[cf.\]  
*Nitzschia delognei* Grunow  
*Nitzschia linearis*  
*Synedra* \[sp.\]  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 106

 *Amphora ovalis* var. *affinis*  
*Amphora pediculus*  
*Fragilaria parasitica*  
*Fragilaria* \[sp.\]  
*Navicula elliptica* Kützing  
*Navicula tenella* Brébisson  
*Nitzschia linearis*  
*Nitzschia sigmoidea*  
*Synedra splendens*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgqiue)"  
Van Heurck 107

 *Cymbella cymbiformis* var. *parva*  
*Cymbella parva* W. Smith  
*Navicula elliptica* Kützing var. *oblongella*  
*Navicula radiosa*  
*Surirella angusta*  
England (Oxfordshire) Thames River; "Thames (Oxford) Angleterre"  
Van Heurck 108

 *Navicula hennedyi* W. Smith f. *maxima*  
South America; "Amèrique du Sud"  
Van Heurck 109

 *Navicula lyra* Ehrenberg f. *major*  
Germany (Schleswig-Holstein) Kiel; "Kiel (Prusse)"  
Van Heurck 110

 *Achnanthes exilis*  
*Achnanthes minutissima*  
*Amphora ovalis* var. *affinis*  
*Cocconeis placentula*  
*Cyclotella kuetzingiana*  
*Denticula tenuis*  
*Navicula elliptica*  
*Navicula tuscula* Ehrenberg  
*Nitzschia angustata* vars. \[unnamed\]  
*Stauroneis punctata* Kützing  
*Staurosira harrissonii*  
*Staurosira mutabilis*  
Belgium (Luxembourg) Orval; "Orval (Belgique)"  
Van Heurck 111

 *Amphora ovalis* var. \[unnamed\]  
*Hantzschia elongata*  
*Navicula cincta* Ehrenberg  
*Navicula crucicula W. Smith*  
*Navicula cuspidata* var. *halophila*  
*Navicula elliptica*  
*Navicula hebes* Ralfs var. *minor*  
*Navicula limosa*  
*Navicula limosa* f. *sporangialis*  
*Navicula major*  
*Navicula peregrina* f. \[unnamed\]  
*Navicula slesvicensis* Grunow  
*Navicula viridis*  
*Navicula viridis* var. \[unnamed\]  
*Nitzschia hybrida GrunowNitzschia vitrea* Norman  
*Surirella ovata*  
England (Humberside) Stoneferry; "Stoneferry près Hull, Yorkshire, (Angleterre)"  
Van Heurck 112

 *Navicula bulnheimii* var. *belgica* Grunow  
*Navicula mutica* Kützing  
*Nitzschia incrustans* Grunow  
*Nitzschia sigma* var. *diminuta*  
Belgium (West-Vlaanderen) Oostende; "Sur un morceau de bois, Ostende (Belgique)"  
Van Heurck 113

 *Navicula mutica* Kützing var. *goeppertiana*  
Belgium (Brabant) Laeken; "Laeken, (Belgique)"  
Van Heurck 114

 *Navicula clepsydra* Donkin  
England, Goswich, Holy Island; "Sables de Goswich, Holy Island, Angleterre"  
Van Heurck 115

 *Actinoptychus undulatus*  
*Amphiprora didyma* W. Smith  
*Amphiprora pusilla* Gregory  
*Amphora salina* W. Smith  
*Hantzschia marina*  
*Hantzschia virgata*  
*Hantzschia vivax*  
*Navicula ammophila* Grunow  
*Navicula angulosa* Gregory  
*Navicula arenicola* Grunow  
*Navicula cancellata* Donkin  
*Navicula granulata*  
*Navicula humerosa*  
*Navicula hyalosira* Cleve  
*Navicula hyalosira* Cleve var. *minor*  
*Navicula lineata* Donkin  
*Navicula northumbrica*  
*Navicula palpebralis* Brébisson  
*Navicula stauntonii* Grunow  
England (Northumberland) Creswell; "Creswell (Angleterre)  
Van Heurck 116

 *Navicula humerosa* Brébisson  
England (Merseyside) Liverpool; "Liverpool (Angleterre)"  
Van Heurck 117

 *Navicula didyma*  
*Navicula marina* Ralfs  
Wales (Dyfed) Neyland; "Neyland (Angleterre)"  
Van Heurck 118

 *Achnanthes coarctata*  
*Hantzschia amphioxys*  
*Melosira roeseana* var. \[unnamed\]  
*Navicula brebissonii* var. *minuta*  
*Navicula mutica* var. *cohnii* Grunow  
*Navicula pusilla* W. Smith  
Wales (Dyfed) Haverfordwest; Haverfordwest (Angleterrre)"  
Van Heurck 119

 *Navicula cuspidata* Kützing  
England (Yorkshire) Harrowgate; "Harrowgate (Angleterre)"  
Van Heurck 120

 *Navicula ambigua* Ehrenberg  
*Navicula cuspidata*  
*Navicula hungarica* Grunow  
*Navicula pygmaea* Kützing \[as "*pymaea*\]"  
*Navicula rhynchocephala* var. \[unnamed\]  
*Navicula salinarum* Grunow  
*Navicula slesvicensis* Grunow  
England (Humberside) Stoneferry; "Stoneferry près Hull, (Angleterre)"  
Van Heurck 121

 *Hantzschia amphioxys*  
*Navicula ambigua* f. *craticularis*  
*Navicula brebissonii* var. *bicuneata*  
*Navicula brebissonii* var. *subcuneata* Grunow  
Austria (Niederösterreich) Berndorf; "Berndorf près Vienne, (Autriche)"  
Van Heurck 122

 *Campylodiscus clypeus*  
*Navicula bohemica*  
*Navicula bohemica* var. *fossilis*  
*Navicula hungarica*  
*Navicula sculpta* Ehrenberg  
*Navicula sphaerophora* v. *biceps* (Ehrenberg)  
*Navicula viridis*  
Hungary (Heves) Eger; "près Egra, Bohême (Fossile)"  
Van Heurck 123

 *Amphora ovalis* var. *affinis* Kützing  
*Navicula sphaerophora* Kützing  
Belgium (Brabant) St-Josse-ten-Noode; "St-Josse-ten-Noode, Bruxelles, (Belgique)"  
Van Heurck 124

 *Eunotia pectinalis* var. *undulata*  
*Navicula serians* Kützing  
England (Humberside) Edgefield; "Edgefield, près Hull, (Angleterre)"  
Van Heurck 125

 *Navicula serians* var. *brachysira* Brébisson  
*Peronia erinacea* Brébisson & Arnott  
*Tabellaria flocculosa*  
Belgium (Namur) Cornimont; "Cornimont (Belgique)"  
Van Heurck 126

 *Navicula falaisensis* Grunow  
*Navicula serians* var. *brachysira* f. *minuta*  
*Tabellaria flocculosa*  
Belgium (Luxembourg) Bouillon; "Bouillon, (Belgique)"  
Van Heurck 127

 *Achnanthidium flexellum* Brébisson  
*Cymbella affinis* var. *truncata* Gregory  
*Cymbella delicatula* Kützing  
*Cymbella subaequalis* var. *incerta* Grunow  
*Denticula tenuis* var. *frigida*  
*Gomphonema intricatum* f. \[unnamed\]  
*Navicula exilis* Grunow  
*Nitzschia denticul*a Grunow f. *major*  
*Synedra amphicephal*a Kützing  
Great Britain (\[?) Canlochlan \[?\] ; "Canlochan\[!\](Angleterre)"  
Van Heurck 128

 *Achnanthes trinodis* Grunow  
*Cymbella delicatula* Kützing  
*Cymbella helvetica* var. \[unnamed\]  
*Cymbella obtusa* Gregory var. *diminuta* Grunow  
*Navicula falaisensis* var. *lanceola* Grunow  
*Navicula obtusa* var. *diminuta* Grunow  
*Navicula zellensis* Grunow  
*Nitzschia denticula*  
*Nitzschia sinuata*  
Scotland (Lothian) Roslin; "Roslin, (Angleterre)"  
Van Heurck 129

 *Navicula amphisbaena* Bory  
Poland (Wroclaw) Strzelin; "Strehlen (Silésie)"  
Van Heurck 130

 *Hantzschia amphioxys* Grunow  
*Navicula salinarum* Grunow  
*Navicula subsalina* Donkin  
*Navicula viridula* var. *slesvicensis* Grunow  
*Pleurosigma spenceri* var. \[unnamed\]  
*Surirella ovata* var. \[unnamed\]  
Belgium (Antwerpen) Austruweel; "Austruweel près d'Anvers (Belgique)"  
Van Heurck 131

 *Cymbella cistula*  
*Cymbella cymbiformis* f. *minor*  
*Cymbella delicatula*  
*Epithemia argus*  
*Epithemia gibba*  
*Navicula elliptica*  
*Navicula hyalosira* Cleve  
*Navicula hyalosira* Cleve var. *minor*  
*Navicula oblonga*  
*Navicula patula* W. Smith  
*Navicula patula* Kützing  
*Navicula radiosa*  
*Navicula vulpina* Kützing  
*Nitzschia angustata*  
*Nitzschia denticula*  
*Nitzschia sinuata*  
*Staurosira harrisonii*  
*Synedra delicatissima* var. \[unnamed\]  
*Synedra splendens* var. \[unnamed\]  
Great Britain (\[?\]) Finnety \[?\]; "Finnety, (Angleterre)"  
Van Heurck 132

 *Navicula formosa* var. *liburnica* Grunow  
Germany (Schleswig-Holstein); "Sleschwig"  
Van Heurck 133

 *Navicula permagna* J. W. Bailey f. *parva*  
Germany (Schleswig-Holstein)' "Sleschwig\[!\], Allemagne"  
Van Heurck 134

 *Navicula limosa* Kützing  
Germany (Schleswig-Holstein); "Holstein"  
Van Heurck 135

 *Navicula affini*s Ehrenberg  
*Navicula firma* var. \[unnamed\]; \["oblique striata"\]  
Poland (Silesia); "Silésie"  
Van Heurck 136

 *Navicula cruciformis* Donkin  
*Navicula cyprinus*  
*Navicula liber* W. Smith  
*Navicula retusa*  
*Nitzschia acuminata*  
*Pleurosigma strigosum*  
*Stauroneis africana* Cleve var. *acuminata* Grunow  
*Stauroneis amphioxys* Gregory  
*Stauroneis gregorii* Ralfs\[cf.\]  
*Stauroneis salina* W. Smith  
England (Norfolk) Wells; "Wells, Norfolk, (Angleterre)"  
Van Heurck 137

 C*ymbella americana* A. Schmidt f. *minor*  
*Eunotia monodon* Ehrenberg f. \[unnamed\]  
*Eunotia pectinalis* var. *macilenta* Grunow  
*Gomphonema insigne* Gregory var. \[unnamed\]  
*Navicula americana* Ehrenberg  
*Navicula brebissonii* \[cf.\]  
*Navicula dactylus* (Ehrenberg) Ralfs var. \[unnamed\]  
*Navicula icostauron* (Ehrenberg) O'Meara  
*Navicula major* vars. \[unnamed\]  
*Navicula nobilis*  
*Navicula viridis* \[cf.\]  
*Nitzschia spectabilis* (Ehrenberg) \[Ralfs\]  
*Stauroneis lanceolata* Ehrenberg var. \[unnamed\]  
*Stauroneis phoenicenteron* f. \[unnamed\]  
United States (New York) Tarrytown; "Dépôt fossile de Torreytown\[!\] (New-York); Etats Unis"  
Van Heurck 138

 *Achnanthes gibberula* var. *angustior* Grunow  
*Achnanthes lanceolata* f. *minuta*  
*Navicula bacillaris* Gregory var. *thermalis*  
*Navicula cincta* Ehrenberg  
*Nitzschia hybrida* Grunow  
*Nitzschia vitrea* Norman  
Germany (Baden-Württemberg) Bad Canstatt; "Source minérale à Canstatt près Stuttgart"  
Van Heurck 139

 *Achnanthes linearis*  
*Achnanthes pusilla* Grunow  
*Encyonema gracile* var. *lineata* (W. Smith) Grunow  
*Encyonema lunula* \[as "*lunula-ventricosum\]*"  
*Encyonema ventricosum* \[as "*lunula-ventricosum\]*"  
*Fragilaria virescens* \[as "*"Fragillaria"*"\]  
*Fragilaria virescens* var. *exigua* Grunow \[as *"Fragillaria"*"\]  
*Gomphonema gracile* var. *acuta*  
*Navicula angusta* Grunow  
*Navicula cocconeiformis* Gregory  
*Navicula divergens* var. \[unnamed\]  
*Navicula elliptica* var. *minor*  
*Navicula falaisensis* Grunow var. *substauroneiformis*  
*Navicula lepida* Gregory  
*Navicula mesolepta*  
*Navicula mesotyla* Schumann \[cf.\]  
*Navicula mesotyla* Ehrenberg \[nec\]  
*Navicula undulata* Gregory var. *subundulata* Grunow  
*Navicula viridis* f. major  
*Nitzschia perpusilla* Rabenhorst var. \[unnamed\]  
*Odontidium mesodon*  
*Surirella linearis* W. Smith  
*Tabellaria flocculosa*  
*Vanheurckia rhomboides* var. *crassinervis*  
Scotland (Grampian) Lochnagar; "Loch-na-gar (Angleterre)"  
Van Heurck 140

 *Achnanthes lanceolata* var. \[unnamed\]  
*Navicula exilissima* Grunow  
*Navicula seminulum* Grunow  
*Nitzschia amphibia* Grunow  
*Nitzschia debilis* Arnott  
*Nitzschia debilis* Kützing \[nec\]  
*Nitzschia sauteriana* Grunow  
Belgium (Brabant) Groenendael; "Groenendael (Belgique)"  
Van Heurck 141

 *Navicula minima* Grunow var. \[unnamed\]  
Belgium (Brabant) Bruxelles; " dans une caraffe, Bruxelles (Belgique)"  
Van Heurck 142

 *Amphora perpusilla* Grunow  
*Encyonema ventricosum* f. *perminuta*  
*Gomphonema angustatum* f. *parvula*  
*Gomphonema olivaceum* f. *parva*  
*Navicula perpusilla* Grunow  
*Navicula seminulum* Grunow  
*Nitzschia fonticola* Grunow var. \[unnamed\]  
*Rhoicosphenia curvata*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 143

 *Navicula muralis* Grunow  
*Nitzschia communis* var. *abbreviata* Grunow  
*Nitzschia communis* var. *obtusa* Grunow  
Great Britain; "Angleterre"  
Van Heurck 144

 *Achnanthes minutissima* f. *perminuta*  
*Achnanthes minutissima* var. *cryptocephala* Grunow  
*Navicula pelliculosa* Brébisson  
France (Calvados) Falaise; "Falaise, France"  
Van Heurck 145

 *Achnanthes coarctata*  
*Achnanthes lanceolata*  
*Diadesmis biceps* Arnott  
*Melosira roeseana* var. \[unnamed\]  
*Navicula contenta* Grunow  
*Navicula mutica*  
*Navicula mutica* var. \[unnamed\]  
*Navicula mutica* var. *quinquenodis* Grunow  
*Navicula trinodis* W. Smith  
*Navicula trinodis* W. Smith var. *biceps*  
*Nitzschia debilis* Arnott  
*Nitzschia sauteriana* Grunow  
*Stauroneis ventricosa* Kützing  
*Tryblionella debilis* Arnott  
Belgium (Brabant) Groenendael; "Groenendael, (Belgique)"  
Van Heurck 146

 *Diadesmis gallica* Brébisson  
*Navicula gallica* Brébisson  
Belgium (Brabant) Bruxelles; "Bruxelles"  
Van Heurck 147

 *Achnanthes coarctata*  
*Achnanthes lanceolata*  
*Diadesmis flotoviana* Grunow  
*Diadesmis flotoviana* Grunow f. \[unnamed\]  
*Melosira roeseana* Rabenhorst  
*Melosira spinosa*  
*Navicula borealis*  
*Navicula contenta* Grunow  
*Navicula flotoviana* Grunow  
*Navicula flotoviana* Grunow f. \[unnamed\]  
*Navicula mutica* var. *undulata*  
*Navicula pusilla*  
France (Orne) Saint Aubert; "Entre les mousses d'un rocher à St-Aubert (Dept de l'Orne) France"  
Van Heurck 148

 *Navicula atomus* Kützing  
Belgium (Antwerpen) Antwerp; "Anvers (Belgique)"  
Van Heurck 149

 *Brebissonia boeckii* Grunow  
*Nitzschia sigma* var. *rigida*  
*Nitzschia* spp.  
*Synedra affinis*  
*Synedra pulchella*  
Great Britain (\[?\]) Findham \[?\]; "Marais saumâtre à Findham (Angleterre)"  
Van Heurck 150

 *Schizonema crucigera* W. Smith  
*Synedra arcus*  
England (Merseyside) Liverpool; "London graving dock à Liverpool, (Angleterre)"  
Van Heurck 151

 *Biddulphia aurita*  
*Melosira borreri*  
*Schizonema grevillei* C. Agardh  
Wales (Dyfed) Neyland; "Neyland, (Angleterre)"  
Van Heurck 152

 *Coscinodiscus excentricus* forms \[unnamed\]  
*Schizonema ramossissimum* C. Agardh var. \[unnamed\]  
*Schizonema smithii* Harvey  
*Schizonema smithii* C. Agardh \[nec\]  
Scotland (Strathclyde) The Cumbraes; "Cumbrae (Angleterre)"  
Van Heurck 153

 *Schizonema smithii* C. Agardh  
France (Calvados); "Côtes du Calvados (France)"  
Van Heurck 154

 *Schizonema smithii* C. Agardh  
*Colletonema lacustre* C. Agardh  
*Colletonema palustre* C. Agardh  
Great Britain; "Angleterre"  
Van Heurck 155

 *Berkeleya micans* (Lyngbye) Grunow  
Italy (Veneto) Venice; "Venise (Italie)"  
Van Heurck 156

 *Berkeleya dillwynii* (C. Agardh) Grunow  
Great Britain; "Angleterre"  
Van Heurck 157

 *Berkeleya rutilans* (C. Agardh) Grunow  
France (Morbihan); "Morbihan (France)"  
Van Heurck 158

 *Berkeleya rutilans* var. *viridis*  
France (Manche) Iles de Chausey; "Iles Chausey (France)"  
Van Heurck 159

 *Navicula cryptocephala*  
*Navicula serians*  
*Vanheurckia rhomboides* (Ehrenberg) Brébisson  
*Vanheurckia rhomboides* Brébisson  
Scotland (Grampian) Bemachie; "Bemachie, Aberdeenshire (Angleterre)"  
Van Heurck 160

 *Amphipleura lindheimeri* var. *truani*  
*Amphora bergrenii* Cleve  
*Encyonema gracile* Rabenhorst  
*Navicula leptogongyla* (Ehrenberg) Grunow \[cf.\] f. *minor*  
*Navicula serians* var. *curta* Grunow  
*Surirella constricta* Ehrenberg  
*Surirella constricta* W. Smith \[nec\]  
*Vanheurckia rhomboides* (Ehrenberg) Brébisson var. *gracilis*  
New Zealand (Canterbury) Arthurs Pass; "Arthur's Pass, Canterbur (Nouvelle-Zélande) à 3000 pieds d'élévation"   
Van Heurck 161

 *Eunotia exigu*a var. \[unnamed\]  
*Eunotia lunaris*  
*navicula appendiculata* var. *irrorata* Grunow f. *minuta*  
*Navicula bisulcata* Lagerstedt  
*Navicula hilseana* Janisch  
*Tabellaria flocculosa*  
*Vanheurckia crassinervia* Brébisson  
*Vanheurckia rhomboides* var. *crassinervis*  
Scotland (Dumfries & Galloway) Crofthead; "près Crofthead (Angleterre)"  
Van Heurck 162

 *Eunotia incisa* var. \[unnamed\]  
*Eunotia lunaris*  
*Tabellaria flocculosa*   
*Vanheurckia rhomboide*s var. *crassinervia*  
*Vanheurckia viridula* Brébisson  
Scotland (Central) Ben Lomond; "Ben Lomond (Angleterre)"  
Van Heurck 163

 *Vanheurckia vulgaris* (Thwaites)Van Heurck  
Belgium (Luxembourg) Rochehaut ; "Rouchehaut (Belgique)"  
Van Heurck 164

 *Amphipleura pellucida* Kützing  
*Cymbella cistula*  
*Encyonema ventricosum*  
*Gomphonema angustatum*  
*Gomphonema olivaceum*  
*Melosira crenulata*  
*Nitzschia dissipata*  
*Nitzschia linearis*  
*Nitzschia palea*  
*Nitzschia subtilis*  
*Synedra arcus* Kützing  
*Synedra subaequalis*  
*Synedra ulna* var. *subaequalis*  
Belgium (Brabant) Rouge Cloître, "Rouge-Cloître (Belgique)"  
Van Heurck 165

 *Amphipleura lindheimeri* Grunow var. *oregonica* Grunow  
*Amphipleura lindheimeri* Grunow var. *truani* Van Heurck  
Spain; "Espagne" \[on slide label only\]  
Van Heurck 166

 *Okedenia inflex*a Eulenstein  
Wales (Dyfed) Neyland; "Neyland (Angleterre)"  
Van Heurck 167

 *Amphora cingulata* Cleve  
*Amphora elegans* Gregory  
*Donkinia recta*  
*Navicula cancellata*  
*Navicula cruciformi*s  
*Navicula rectangularis*  
*Navicula retusa*  
*Nitzschia spathulat*a \[as "*spathulatha*"\]  
*Toxonidea insignis* Donkin  
Great Britain; "Angleterre"  
Van Heurck 168

 *Pleurosigma angulatum* W. Smith  
France; "France"  
Van Heurck 169

 *Navicula arenaria*  
*Navicula cyprinus*  
*Pleurosigma balticum*  
*Pleurosigma speciosum* W. Smith  
*Pleurosigma strigosum* W. Smith  
England (Essex) Harwich; "Harwich (Angleterre)"  
Van Heurck 170

 *Pleurosigma angulatum* \[cf.\]  
*Pleurosigma quadratu*m W. Smith var. \[unnamed\]  
Germany (Schleswig-Holstein); "Schleswig"  
Van Heurck 171

 *Plagiotropis vitrea*  
*Pleurosigma acuminatum* W. Smith  
*Pleurosigma acuminatum* Kützing \[nec\]  
*Pleurosigma aestuarii* W. Smith  
*Pleurosigma brebissonii* \[cf.\]  
*Pleurosigma delicatulum*  
*Pleurosigma scalprum* Grunow \[cf.\]  
*Pleurosigma scalprum* var. *gallica* Grunow  
*Pleurosigma wansbeckii* Donkin  
*Stauroneis salina* W. Smith var. \[unnamed\]  
*Surirella gemm*a  
France; "France"  
Van Heurck 172

 *Pleurosigma elongatum* W. Smith  
*Pleurosigma strigilis*  
England (Essex); "Essex (Angleterre)"  
Van Heurck 173

 *Amphiprora alata*  
*Melosira borreri*  
*Melosira nummuloides*  
*Nitzschia hungarica*  
*Pleurosigma delicatulum* \[cf.\]  
*Pleurosigma intermedium* W. Smith  
*Synedra affinis*  
*Synedra tabulata*  
England (Essex) East Tilbury; "East Tilbury (Angleterre)"  
Van Heurck 174

 *Plagiotropis vanheurckii* \[as "*Plagiotroopis*"\]  
*Pleurosigma aestuarii* W. Smith f. *major*  
*Pleurosigma affine* Grunow f. *minor*  
*Pleurosigma affine*  
*Pleurosigma normanni* Ralfs  
*Rhaphoneis amphiceros*  
Sample from the Walker Arnott Collection  
Belgium (Brabant) Blakenberge; "Blankenberghe\[!\] (Belgique)"  
Van Heurck 175

 *Pleurosigma strigilis* W. Smith  
Germany (Schleswig-Holstein); "Holstein"  
Van Heurck 176

 *Pleurosigma formosum* W. Smith  
Great Britain; "Angleterre"  
Van Heurck 177

 *Pleurosigma rigidum* W. Smith  
Brazil; "Brésil"  
Van Heurck 178

 *Pleurosigma balticum* var. *beta* W. Smith  
*Pleurosigma brebissoni*i Grunow  
*Pleurosigma hippocampus* W. Smith  
England (London) Woolwich; "Woolwich (Angleterre)"  
Van Heurck 179

 *Pleurosigma balticum* W. Smith  
France (Calvados) Courseulles-sur-Mer; "Courceules\[!\] (France)"   
Van Heurck 180

 *Pleurosigma acuminatum* (Kützing) Grunow  
*Pleurosigma lacustre* W. Smith  
Scotland (Strathclyde) Ardeer; "Ardeen\[!\] Quarry près Saltcoats, (Angleterre)"  
Van Heurck 181

 *Amphora ovalis*  
*Amphora pediculus*  
*Fragilaria elliptica*  
*Navicula cardinalis*  
*Navicula cryptocephala*  
*Navicula radiosa*  
*Pleurosigma attenuatum* (Kützing) W. Smith  
*Pleurosigma attenuatum* Kützing  
*Staurosira elliptica*  
Belgium (Brabant) Bruxelles  
Van Heurck 182

 *Cymatopleura solea*  
*Navicula affinis*  
*Navicula viridis*  
*Pleurosigma kuetzingii* Grunow \[cf.\] \[as "*kützingii*"\]  
*Pleurosigma spenceri* W. Smith var. *acutiuscule* Grunow  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 183

 *Amphora perpusilla* Grunow  
*Colletonema neglectum*  
*Melosira arenaria*  
*Navicula gracilis<*br> *Navicula radiosa*  
*Pleurosigma spenceri* W. Smith var. *nodiferum* Grunow  
*Rhoicosphenia curvata*  
Belgium (Brabant) Bruxelles; "Bruxelles, (Belgqiue)"  
Van Heurck 184

 *Pleurosigma spencer*i var. *curvula* Grunow  
Northern Ireland (Antrim\[?\]) Queen's Island, Belfast Bay; "Queen's Island, Belfast Bay, (Irlande)"  
Van Heurck 185

 *Amphora ovalis* var. *affinis*  
*Navicula hungarica* Grunow  
*Navicula peregrina*  
*Navicula rhynchocephala* Kützing  
*Nitzschia hungarica*  
*Pleurosigma spenceri* var. *smithii* Grunow  
Surirella ovata  
England (Humberside) Kingston-upon-Hull; "Hull (Angleterre)"  
Van Heurck 186

 *Pleurosigma kuetzingii* Grunow  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 187

 *Pleurosigma balticum* var. *beta* W. Smith  
*Pleurosigma brebissonii* Grunow  
*Pleurosigma scalprum* Ralfs  
*Pleurosigma scalprum* Gaillon \[nec\]  
France; "France"  
Van Heurck 188

 *Navicula cincta* f. *minuta*  
*Navicula lanceolata* Kützing var. *phyllepta* Kützing  
*Navicula phyllepta* Kützing var. \[unnamed\]  
*Pleurosigma brebissonii* Grunow  
*Pleurosigma spenceri*  
Belgium (West-Vlaanderen) Oostende; "Ostende (Belgique)"  
Van Heurck 189

 *Amphora ovalis* var. *affinis*  
*Cocconeis placentula*  
*Colletonema neglectum*  
*Cymbella cistula*  
*Cymbella ehrenbergii*  
*Cymbella gastroides*  
*Cymbella lanceolata*  
*Cymbella tumida*  
*Encyonema caespitosum*  
*Epithemia gibba*  
*Epithemia sorex*  
*Epithemia zebra*  
*Gomphonema constrictum*  
*Melosira crenulata* var. *tenuis*  
*Melosira granulata*  
*Melosira tenuis*  
*Melosira varians*  
*Navicula amphisbaena*  
*Navicula cryptocephala*  
*Navicula elliptica*  
*Navicula gracilis*  
*Navicula humilis*  
*Navicula menisculus*  
*Navicula radiosa*  
*Navicula sphaerophora*  
*Nitzschia acuminat*a \[as "*Nitszchia*"\]  
*Nitzschia dissipat*a var. *media* Hantzsch \[as "*Nitszchia*"\]  
*Nitzschia levidensis* \[as "*Nitszchia*"\]  
*Nitzschia littoralis* \[as "N*itszchia*"\]  
*Nitzschia media* Hantzsch \[as "*Nitszchia*"\]  
*Nitzschia subtilis* \[as "*Nitszchia*", as "*subtiles*"\]  
*Pleurosigma parkerii* Harrisson  
*Rhoicosphenia curvata*  
*Staurosira brevistriata* var. \[unnamed\]  
*Staurosira construens*  
*Staurosira intermedia*  
*Staurosira mutabilis*  
*Staurosira venter* var. *venter*  
*Synedra longissima*  
*Synedra splendens*  
*Synedra ulna*  
*Tryblionella littoralis*  
Belgium (Antwerpen) Antwerp; "Etang du Parc à Anvers (Belgique)"  
Van Heurck 190

 *Pleurosigma angulatum* var. *undulata* Grunow  
*Pleurosigma fasciol*a W. Smith f. *major*  
*Surirella gemma*  
Northern Ireland (Antrim\[?) Queen's Island, Belfast Bay' "Queen's Island, Belfast Bay, (Irlande), sur un mur"  
Van Heurck 191

 *Navicula gregaria*  
*Navicula pygmaea*  
*Navicula salinarum*  
*Nitzschia sigma* var. \[unnamed\]  
*Pleurosigma fasciol*a W. Smith f. *minor*  
*Pleurosigma spenceri* var. *peisonis* Grunow  
Germany (Schleswig-Holstein); "Holstein"  
Van Heurck 192

 *Nitzschia sigm*a var. *diminut*a  
*Nitzschia sigma* var. *rigidula*  
*Pleurosigma eximium* (Brébisson) Van Heurck  
*Pleurosigma eximium* Brébisson  
England (Humberside) Stallingborough; "Stallingborough, près Great Grimsby, (Angleterre)"  
Van Heurck 193

 *Amphiprora decussata*  
*Amphiprora didyma*  
*Amphiprora pusilla*  
*Donkinia recta* (Donkin) Grunow  
*Donkinia recta* Grunow  
*Pleurosigma marinum* Donkin  
*Toxonidea insignis*  
England (Northumberland); "Northunmberland (Angleterre)"  
Van Heurck 194

 *Amphiprora alata* (Ehrenberg) Kutaing  
*Amphiprora alata* Kützing  
*Nitzschia sig*ma var. *genuina*  
*Pleurosigma angulatum*  
Great Britain; "Angleterre"  
Van Heurck 195

 *Achnanthes hungarica*  
*Amphiprora paludosa* W. Smith  
*Amphora veneta*  
*Cocconeis placentula* var. \[unnamed\]  
*Diatoma elongatum*  
*Gomphonema montanum*  
*Gomphonema subclavatum*  
*Navicula pannonica*  
*Navicula protracta*  
*Navicula radiosa*  
*Navicula rhynchocephala*  
*Navicula salinarum*  
*Navicula slesvicensis*  
*Nitzschia palea*  
*Synedra affinis*  
*Synedra pulchella*  
Belgium (Antwerpen) Austruweel; "Austruweel près d'Anvers )Belgique)"  
Van Heurck 196

 *Amphiprora lepidoptera* Gregory  
*Amphora cingulata* Cleve  
*Coscinodiscus excentricus*  
*Coscinodiscus radiatus*  
*Navicula aestiva* Donkin  
*Navicula apiculata* var. *crucifera* Grunow  
*Navicula arenaria*  
*Navicula cancellata* Donkin  
*Navicula cruciformis* Donkin  
*Navicula didyma*  
*Navicula lyra*  
*Navicula rectangula* Gregory  
*Navicula suborbicularis* (Gregory) Donkin  
Scotland (Strathclyde) The Cumbraes; "Cumbrae, (Angleterre)"  
Van Heurck 197

 *Plagiotropis vanheurckii* Grunow  
Belgium (West-Vlaanderen) Blankenberge; "Blankenberghe\[!\], (Belgique)"  
Van Heurck 198

 *Plagiotropis elegans* W. Smith  
Germany (Schleswig-Holstein); "Holstein"  
Van Heurck 199

 *Plagiotropis mediterranea* Grunow  
United States (California); "Californie"  
Van Heurck 200

 *Scoliopleura tumida* (Brébisson) Rabenhorst  
*Scoliopleura tumida* Brébisson  
France  
Van Heurck 201

 *Scoliopleura convexa*  
*Scoliopleura latestriata* (Brébisson) Grunow  
France  
Van Heurck 202

 *Gomphonema herculeanum* Ehrenberg  
United States, Lake Erie ; "Lac Erié, Amér\[ique\] Sept\[entrionale\]"  
Van Heurck 203

 *Cymbella affinis*  
*Cymbella helvetica*  
*Encyonema caespitosum*  
*Gomphonema geminatum* C. Agardh  
Scotland (Strathclyde) Gourock; "Gourock (Angleterre)"  
Van Heurck 204

 *Encyonema ventricosum*  
*Encyonema ventricosum* var. *lunula*  
*Encyonema ventricosum* var. *minuta*  
*Gomphonema constrictu*m Ehrenberg  
*Nitzschia linearis*  
Wales (Dyfed) Haverfordwest; "Haverfordwest (Angleterre)"  
Van Heurck 205

 *Cocconeis placentula*  
*Cymatopleura solea*  
*Cymbella cistula* var. \[unnamed\]  
*Encyonema ventricosum*  
*Epithemia sorex*  
*Gomphonema capitatum Ehrenberg* f. *curta*  
*Gomphonema constrictum* var. *capitatum*  
*Gomphonema constructum* var. *capitatum* f. *curta* *Gomphonema parvulum*  
*Navicula cryptocephala*  
*Staurosira mesolepta*  
*Synedra splendens* f. \[unnamed\]; \[as "formae breviores"\]  
*Synedra ulna* var. *splendens* \["formae breviores"\]  
Belgium (Antwerpen) Antwerp; "Anvers (Belgique)"  
Van Heurck 206

 *Gomphonema eriense* Grunow  
United States, Lake Erie; "Lac Erié, Amér\[ique\] Sept\[entrionale\]"  
Van Heurck 207

 *Amphora pediculus* (Kützing) Grunow  
*Gomphonema augur* Ehrenberg  
*Melosira varians*  
*Navicula seminulum* Grunow  
*Nitzschia amphibia* var. *acutiuscula*  
*Nitzschia dissipata* (Kützing) Grunow  
*Synedra tenera* W. Smith  
Belgium (Brabant) Schaerbeek, near Brussels; Schaerbeeck\[!\], près Bruxelles (Belgique)"  
Van Heurck 208

 *Gomphonema turris* Ehrenberg  
New Zealand; "Nouvelle Zèlande"  
Van Heurck 209

 *Gomphonema subclavatu*m Grunow  
Germany (Schleswig-Holstein) Wedel; "Wedel (Holstein)"  
Van Heurck 210

 *Achnanthes minutissima*  
*Achnanthes minutissima* var. *cryptocephala*  
*Cymbella affinis*  
*Cymbella helvetica*  
*Cymbella leptoceros* Kützing \[as "leptoceras"\]  
*Cymbella leptoceros* \[nec\] Ehrenbergf f. *curta* \[as "leptoceras"\]  
*Cymbella microcephala* Grunow  
*Gomphonema commutatum* Grunow var. obliqua  
*Gomphonema constrictum* var. \[unnamed\]  
*Gomphonema parvulum*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 211

 *Epithemia gibberula* var. *rupestris*  
*Gomphonema commutatum* Grunow  
*Gomphonema commutatum* Grunow var. *obliqua*  
*Gomphonema gracile* Ehrenberg  
*Gomphonema gracile* Ehrenberg var. *aurita* A. Braun  
*Navicula alpestris* \[cf.\]  
*Navicula bogotensis* \[cf.\]  
*Navicula divergens* \[cf.\]  
*Navicula elliptica* f. *minor*  
*Navicula perpusilla* Grunow  
*Navicula schumanni* \[cf.\]  
*Navicula stomatophora* Grunow  
*Navicula stomatophor*a Grunow f. *minor*  
*Navicula viridis* var. *commutata* Grunow  
*Orthosira dickiei*  
Scotland; "Ecosse"  
Van Heurck 212

 *Gomphonema vibrio* Ehrenberg  
Seychelles, Mahe; "Mahé (Archipel des Seychelles)"  
Van Heurck 213

 *Cocconeis pediculus*  
*Gomphonema intricatum* Kützing var. *pumila* Grunow  
*Nitzschia denticula*  
*Synedra splendens*  
*Synedra ulna* var. *splendens*  
England (Wiltshire) Devizes; "Devizes (Angleterre)"  
Van Heurck 214

 *Gomphonema angustatum* Kützing  
Germany; "Allemagne"  
Van Heurck 215

 *Achnanthes lanceolata*  
*Gomphonema angustatum*  
*Gomphonema angustatum var.* sarcophagus Gregory  
Great Britain; "Angleterre"  
Van Heurck 216

 *Gomphonema angustatum* var. *producta* Grunow  
Belgium (Namur) Vresse; "Vresse (Belgique)"  
Van Heurck 217

 *Gomphonema angustatum*  
*Gomphonema micropus* Kützing  
*Navicula avenacea* Brébisson  
*Navicula radiosa*  
Scotland (Strathclyde) Glasgow; "Glasgow (Ecosse)"  
Van Heurck 218

 *Amphora pediculus*  
*Gomphonema micropus* Kützing var. *minor* Grunow  
*Gomphonema parvulum*  
*Navicula atomoides*  
*Navicula seminulum*  
*Nitzschia communis*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 219

 *Encyonema gracile*  
*Eunotia impressa* var. *angusta*  
*Gomphonema acuminatum*  
*Gomphonema parvulum* Kützing  
*Gomphonema parvulum* (Kützing)\[Kützing?\] var. *exilissima* Grunow  
*Navicula aponina* Kützing  
*Navicula brachysira* \[cf.\]  
*Navicula radiosa*  
*Synedra amphicephala* Kützing  
*Synedra radians* Kützing  
Scotland (Strathclyde) Arran; "Arran (Ecosse)"  
Van Heurck 220

 *Amphipleura pellucida*  
*Cocconeis pediculus*  
*Cymbella cistula*  
*Encyonema ventricosum*  
*Gomphonema commutatum* var. *obliqua*  
*Gomphonema constrictum*  
*Gomphonema olivaceum* Ehrenberg  
*Navicula radiosa*  
*Nitzschia linearis*  
*Synedra arcus*  
*Synedra deliacatissima*  
*Synedra radians*  
Belgium (Brabant) Rouge Cloître; "Rouge-Cloître (Belgique)"  
Van Heurck 221

 *Gomphonema balticum* Cleve  
Baltic Sea; "Mer Baltique"  
Van Heurck 222

 *Gomphonema exiguum* Kützing var. *pachycladium*  
*Rhoicosphenia curvata* var. *marina*  
*Synedra affinis* var. *fasciculata*  
*Synedra affinis* var. \[unnamed\]  
France (Calvados) Port-en-Bessin; "Port-en-Bassin\[!\] (France)"  
Van Heurck 223

 *Cocconeis pediculus*  
*Rhoicosphenia curvata* Grunow  
Germany; "Allemagne"  
Van Heurck 224

 *Grammatophora marina* var. *lyngbei* Grunow  
*Rhoicosphenia curvata* Grunow var. *marina*  
Great Britain (\[?\]) Hambro Head; "Hambro Head (Angleterre)"  
Van Heurck 225

 *Achnanthidium flexellum* Brébisson  
Germany (Schleswig-Holstein); "Holstein"  
Van Heurck 226

 *Achnanthes brevipes* C. Agardh  
Germany; "Allemagne"  
Van Heurck 227

 *Achnanthes brevipes* C. Agardh forms \[unnamed\]  
*Achnanthes subsessilis* \[cf.\]  
England (Devon); Teignmouth; "Teignmouth (Angleterre)"  
Van Heurck 228

 A*chnanthes longipes* C. Agardh  
Baltic Sea; "Mer Baltique"  
Van Heurck 229

 *Achnanthes coarctata* Brébisson  
*Hantzschia amphioxys*  
*Melosira roeseana*  
*Navicula contenta*  
Belgium (Luxembourg) Frahan; "Frahan (Belgique)"  
Van Heurck 230

 *Achnanthes brevipes*  
*Achnanthes longipes*  
*Achnanthes subsessilis* Ehrenberg  
*Melosira nummuloides*  
England (Humberside) Kingston-upon-Hull; "Hull (Angleterre)"  
Van Heurck 231

 *Achnanthes parvula* Kützing  
\[Sample contains "Frustules"\]  
Wales (Dyfed) Neyland; "Neyland (Angleterre)"  
Van Heurck 232

 *Achnanthes parvula* Kützing  
\[Sample contains "Valves"\]  
Wales (Dyfed) Neyland; "Neyland (Angleterre)"  
Van Heurck 233

 *Achnanthes delicatula* (Kützing) Grunow  
*Epithemia succincta* Brébisson  
*Mastogloia dansei*  
*Navicula neglectum*  
*Nitzschia hungarica* Grunow  
*Schizonema neglectumSynedra affinis* var. \[unnamed\]  
*Synedra pulchella* var. \[unnamed\]  
*Synedra tabulata*  
England (Humberside) Broomfleet, near Kingston-upon-Hull; "Bromfleet\[!\], près Hull, (Angleterre)"  
Van Heurck 234

 *Achnanthes lanceolata* Grunow  
Belgium (Brabant) St-Josse-ten-Noode; "St-Josse-ten-Noode (Belgique)"  
Van Heurck 235

 *Achnanthes lanceolata* var. *dubia* Grunow f. *minuta*  
*Nitzschia frustulum* var. *minutula* Grunow  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 236

 *Achnanthes biasolettiana* Grunow var. *perminuta* \[as "*Achnantes*"\]  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 237

 *Achnanthes minutissima* Kützing var. *cryptocephala*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 238

 *Achnanthes sinuata* (Kützing) Grunow  
Germany; "Allemagne"  
Van Heurck 239

 *Orthoneis splendida* (Gregory) Grunow  
Japan; "Japon"  
Van Heurck 240

 *Orthoneis fimbriata* (Brightwell) Grunow  
Mediterranean Sea; "Mer Méditerranée"  
Van Heurck 241

 *Grammatophora oceanica* var. *macilenta*  
*Grammatophora serpentina*  
*Orthoneis binotata* Grunow  
*Synedra gaillonii*  
Great Britain; "Angleterre"  
Van Heurck 242

 *Campyloneis grevillei* Grunow  
*Cocconeis scutellum*  
*Grammatophora oceanica*  
*Grammatophora serpentina*  
*Navicula aspera*  
*Orthoneis binotata* Grunow  
Channel Islands (Jersey); "Jersey (Angleterre)"  
Van Heurck 243

 *Cocconeis coelata* Gregory  
*Navicula coelata* Grunow  
New Zealand; "Nouvelle-Zélande"  
Van Heurck 244

 *Cocconeis scutellum* Ehrenberg f. *major*  
Belgium (West-Vlaanderen) Oostende; "Ostende\[!\] (Belgique)"  
Van Heurck 245

 *Cocconeis scutellum* Ehrenberg  
Germany; "Allemagne"  
Van Heurck 246

 *Cocconeis dirupta* Gregory  
Great Britain; "Angleterre"  
Van Heurck 247

 *Cocconeis pediculus* Ehrenberg  
*Gomphonema tenellum* Kützing  
*Gomphonema tenellum* W. Smith \[nec\]  
*Rhoicosphenia curvata*  
Belgium (Antwerpen) Antwerp; "Anvers, (Belgique)"  
Van Heurck 248

 *Amphora ovalis*  
*Cocconeis pediculus* Ehrenberg \[var?/f?\] major  
*Colletonema neglectum* \[as "*negletum*"\]  
*Cymbella cistula*  
*Cymbella helvetica* var. \[unnamed\]  
*Cymbella lanceolata*  
*Diatoma vulgare*  
*Navicula gracilis*  
*Pleurosigma attenuatum*  
*Rhoicosphenia curvata*  
*Synedra splendens*  
England (Buckingham) Great Marlow; "Tamise, près Great Marlone\[!\] (Angleterre)"  
Van Heurck 249

 *Cocconeis lineata* Ehrenberg  
*Cocconeis placentula*  
*Gomphonema commutatum* var. *mexicanum*  
*Gomphonema mexicanum* Grunow  
*Nitzschia amphibia* var. *acutiuscula* Grunow  
*Nitzschia subtilis* var. *mexicana* Grunow  
Mexico; "Mexico"  
Van Heurck 250

 *Epithemia turgida* Kützing  
*Melosira crenula* var. \[unnamed\]  
Belgium (Limburg) Sint-Truiden; "St-Trond (Belgique)"  
Van Heurck 251

 *Epithemia hyndmanni* W. Smith  
Germany; "Allemagne"  
Van Heurck 252

 *Epithemia sorex*  
*Epithemia zebra* Kützing  
Belgium (Anwterpen) Antwerp; "Anvers (Belgique)"  
Van Heurck 253

 *Epithemia zebra* Kützing var. *proboscidea* Grunow  
*Melosira zebra* \[nec\] W. Smith  
Belgium (Namur) Alle; "Alle (Belgique)"  
Van Heurck 254

 *Epithemia argus* Ehrenberg  
*Nitzschia sinuata*  
Belgium (Luxembourg) Frahan; "Frahan (Belgique)"  
Van Heurck 255

 *Epithemia gibb*a Kützing  
Scotland (Highland) Dunnet; "Dunnet (Angleterre)"  
Van Heurck 256

 *Amphora aponina* Kützing  
*Cymbella delicatula*  
*Cymbella helvetica* var. *obtusa* Grunow  
*Cymbella laevis*  
*Denticula elegans* Kützing  
*Denticula ocellata* W. Smith  
*Denticula tenuis* var. \[unnamed\]  
*Epithemia argus*  
*Epithemia gibba* Kützing var. \[unnamed\]  
*Epithemia gibba* Kützing var. *parallela* \[cf.\]  
*Gomphonema intricatum* var. \[unnamed\]  
*Synedra delicatissima* var. \[unnamed\]  
Scotland (Borders) Saint Abb's Head; "S. Abbe Head (Angleterre)"   
Van Heurck 257

 *Cymbella cistula*  
*Cymbella lanceolata*  
*Cymbella tumida*  
*Epithemia gibba* Kützing var. *ventricosa*  
*Fragilaria capucina*  
*Navicula radiosa*  
*Synedra splendens*  
England (Wiltshire) Devizes; "Devizes (Angleterre)"  
Van Heurck 258

 *Cocconeis placentula*  
*Cymbella affinis*  
*Cymbella cistula* var. \[unnamed\]  
*Encyonema caespitosum* \[as "*coespitosum*"\]  
*Epithemia sorex* Kützing  
*Epithemia zebra*  
*Navicula cryptocephala*  
*Navicula gracilis*  
*Rhoicosphenia curvata*  
*Stephanodiscus hantzschianus*  
Belgium (Antwerpen) Antwerp; "Anvers (Belgique)"  
Van Heurck 259

 *Epithemia succincta* Brébisson  
*Mastogloia dansei*  
*Mastogloia dansei* var. *elliptica*  
*Navicula cyprinus* var. *digitoradiata* \[as "*digito-radiata*"\]  
*Navicula digitoradiata* Gregory \[as "*digito-radiata*"\]  
*Nitzschia vitrea*  
*Surirella brightwellii* var. \[unnamed\]  
England (Northumberland) Coquet River; "Coquet Mouth (Anglterre)"  
Van Heurck 260

 *Amphora acutiuscula* Kützing  
*Amphora salina*  
*Epithemia constricta* W. Smith  
*Navicula cyprinus* var. *digitoradiata* Grunow f. \[unnamed\]\[as "*digito-radiata*"\]  
*Navicula digitoradiata* Grunow  
*Navicula reinhardtii*  
Belgium (West-Vlaanderen) Blankenberge; "Blankenberghe\[!\] (Belgique)"  
Van Heurck 261

 *Eunotia gracilis* \[nec\] W. Smith  
*Eunotia gracilis* Ehrenberg f. *minor*  
*Eunotia paludos*a var. *groenlandica* Grunow  
*Himantidium gracile* Ehrenberg  
Scotland (Strathclyde) Gourock; "près Gourock (Angleterre)"  
Van Heurck 262

 *Encyonema gracile*  
*Eunotia bactriana*  
*Eunotia denticulata*  
*Eunotia incisa*  
*Eunotia pentaglyphis*  
*Eunotia robusta* var. *novemodon* \[as "9-don"\] *Eunotia robusta* var. *decadon* \[as "10-odon"\]  
*Eunotia robusta* var. *diadema*  
*Eunotia robusta* var. *octodon* \[as "8-odon"\]  
*Eunotia robust*a var. *serra*  
*Eunotia robusta* var. *tetraodon*  
*Eunotia tetraodonEunotia triodon* Ehrenberg \[See Patrick & Reimer, 1966, pl. 12, fig. 1  
*Melosira nivalis*  
*Navicula brachysira* var. *obtusiuscula*\[as "*brachysyra*"\]  
*Navicula major*  
*Navicula serians*  
*Navicula viridis*  
*Pseudoeunotia hemicyclus* Grunow \[as "*Pseudo-Eunotia*"\]  
*Tabellaria binalis* Grunow  
*Tabellaria fenestrata*  
*Tabellaria flocculosa<*br> *Tetracyclus lacustris*  
*Vanheurckia rhomboides*  
Sweden (Göteborg och Bohus) Lillhagen; "Lillhaggjon (Suède)"  
Van Heurck 263

 *Achnanthes lanceolata* *Eunotia pectinalis* Ehrenberg var. \[unnamed\]  
*Eunotia pectinalis* var. *undulata*  
Great Britain; "Angleterre" \[on slide label only\]  
Van Heurck 264

 *Eunotia pectinalis* Ehrenberg var. *undulata*  
*Himantidium undulatum* \[See Patrick & Reimer, 1966, pl. 12, fig. 11,  
*Eunotia pectinalis* var. *ventricosa*  
*Tabellaria flocculosa*  
Great Britain; "Angleterre" \[on slide label only\]  
Van Heurck 265

 *Eunotia pectinalis* Ehrenberg  
Poland (Silesia); "Silésie"  
Van Heurck 266

 *Eunotia formica* Ehrenberg var. *subnodosa* Grunow  
Wales (Dyfed) Haverfordwest; "Haverfordwest (Angleterre)"  
Van Heurck 267

 *Eunotia arcus* Ehrenberg var. *curta*  
*Eunotia arcus* var. *minor*  
*Eunotia arcus* var. *tenella*  
Great Britain; "Angleterre" \[on slide label only\]  
Van Heurck 268

 *Achnanthes minutissima*  
*Eunotia arcus* Ehrenberg var. \[unnamed\]  
*Eunotia lunaris*  
*Eunotia uncinata* \[cf.\]  
*Himantidium arcus* var. \[unnamed\]  
*Navicula aponina* Kützing  
*Synedra delicatissima*  
*Synedra longissima*  
*Synedra splendens*  
*Synedra tenera*  
*Tabellaria fenestrata*  
*Tabellaria flocculosa*  
Wales (Dyfed) Haverfordwest; "Haverfordwest (Angleterre)"  
Van Heurck 269

 *Eunotia exigua* (Brébisson) Grunow  
Scotland (Central) Castlecary; "Castle Carry Station (Angleterre)"  
Van Heurck 270

 *Eunotia incisa*  
*Eunotia major* Rabenhorst  
*Fragilaria virescens*  
*Melosira nivalis*  
*Navicula cocconeiformis*  
*Navicula viridis* var. *rupestris*  
Scotland (Grampian) Lochnagar; "Loch-na-gar (Angleterre)"  
Van Heurck 271

 *Achnanthes lanceolata*  
*Eunotia lunaris* (Ehrenberg) Grunow  
*Eunotia lunaris* Grunow  
*Melosira nivalis*  
*Synedra lunaris*  
Scotland (Strathclyde) Glasgow; "Glasgow \[on printed cards\] (Angleterre) \[on slide label)"  
Van Heurck 272

 *Desmogonium guyanense* Ehrenberg  
Brazil; "Brésil"  
Van Heurck 273

 *Actinella punctata* Grunow  
*Encyonema gracile*  
*Eunotia arcus*  
*Eunotia bactriana*  
*Eunotia denticulata*  
*Eunotia faba* \[*=Eunotia vanheurckii* Patrick var. *vanheurckii* fide Patrick & Reimer, 1966, p. 210; see pl. 13, fig. 7\]  
*Eunotia impressa* var. *angusta* Grunow  
*Eunotia incisa* var. \[unnamed\]  
*Eunotia paludosa*  
*Eunotia paludosa* var. *aleulus* Grunow  
*Eunotia parallela* var. *angusta*  
*Eunotia robusta* var. "4-16-odon" \[= Eunotia *serra* Ehrenberg var. *serra* fide Patrick & Riemer, 1996, p. 201; see pl. 12, figs. 1-3\]  
*Eunotia triodon*  
*Eunotia uncinata*  
*Fragilaria virescens* var. *exigua* Grunow  
*Gomphonema gracile*  
*Navicula angusta*  
*Navicula bicapitata* \[as "*bicapita*"\]  
*Navicula brachysira*  
*Navicula brachysira* var. *amphipleuroides*  
*Navicula brachysira* var. *minima*  
*Navicula follis*  
*Navicula gibba*  
*Navicula major*  
*Navicula serians*  
*Navicula viridis*  
*Peronia erinacea* Brébisson  
*Tabellaria fenestrata*  
*Tabellaria flocculosa*  
*Vanheurckia rhomboides*  
Norway; "Norwège"  
Van Heurck 274

 *Cymbella heteropleura* Ehrenberg  
*Eunotia denticulata*  
*Eunotia triodon*  
*Navicula bicapitata*  
*Navicula major*  
*Navicula minima* Grunow  
*Navicula serians* var. \[unnamed\]  
*Navicula viridis*  
*Pseudoeunotia hemicyclus* (Ehrenberg) Grunow \[as "*Pseudo-eunotia*"\]  
*Tabellaria binalis*  
*Tabellaria fenestrata*  
\[No locality\]  
Van Heurck 275

 *Rhaphoneis amphicero*s Ehrenberg  
North Sea; "Mer du Nord"  
Van Heurck 276

 *Rhaphoneis belgica* Grunow  
Belgium (Brabant) Blankenberge; "Blankenberghe\[!\] (Belgique)"   
Van Heurck 277

 *Rhaphoneis castracanii* Grunow  
Samoa; "Iles Samoa"  
Van Heurck 278

 *Sceptroneis caduceus* Ehrenberg  
North America; "Amér\[ique\] Septent\[rionale\]"  
Van Heurck 279

 *Sceptroneis gemmata* Grunow  
Denmark (Thisted) Mors; "Ile de Mors"  
Van Heurck 280

 *Ceratoneis arcus* Kützing  
*Gomphonema angustatum* var. \[unnamed\]  
*Gomphonema micropus* \[cf  
*Gomphonema parvulum*  
Belgium (Luxembourg) Rochehaut; "Rochehaut (Belgique)"  
Van Heurck 281

 *Thalassiothrix longissima* Cleve & Grunow  
Davis Strait; "Détroit de Davis"  
Van Heurck 282

 *Cocconeis pediculus*  
*Synedra capitata* Ehrenberg  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 283

 *Gomphonema constrictum*  
*Navicula globiceps* var. \[unnamed\]  
*Navicula inflata*  
*Navicula lepida*  
*Synedra oxyrhynchus* Kützing  
*Synedra uln*a Ehrenberg \["genuina"\]  
Scotland (Lothian) Duddingston Loch; "Duddingston Loch (Angleterre)"  
Van Heurck 284

 *Eunotia biceps* \[nec\]  
*Gomphonema parvulum*  
*Gomphonema subclavatum*  
*Gomphonema tenellum*  
*Synedra ulna* Ehrenberg var. *biceps* Kützing f. \[unnamed\]  
*Tabellaria fenestrata*  
*Tabellaria flocculosa*  
England (Lancashire) Lancaster; "près Lancaster (Angleterre)"  
Van Heurck 285

 *Synedra longissima* \[cf.\]  
*Synedra ulna* Ehrenberg  
*Synedra ulna* Ehrenberg var. *subaequalis* Grunow  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 286

 *Synedra ulna* Ehrenberg  
*Synedra ulna* Ehrenberg var. *longissima* W. Smith  
Belgium (West-Vlaanderen) Oostende, Blankenberge; "Entre Ostende\[!\] et Blankenberghe\[!\] (Belgique)"   
Van Heurck 287

 *Amphora ovalis*  
*Gomphonema angustatum*  
*Meridion circulare*  
*Nitzschia linearis*  
*Nitzschia sigmoidea*  
*Synedra ulna* Ehrenberg var. *danica* Kützing  
Scotland (Strathclyde) The Cumbraes; "Cumbrae (Angleterre)"  
Van Heurck 288

 *Eunotia lunaris*  
*Synedra radians* Kützing f. parva  
*Tabellaria flocculosa*  
Belgium (Oost-Vlaanderen) Saint Laurent, near Antwerp; "St-Laurent près d'Anvers (Belgique)"  
Van Heurck 289

 *Cymbella cistula*  
*Pleurosigma attenuatum*  
*Synedra acula* Kützing  
*Synedra capitata*  
England (Humberside) Kingston-upon-Hull; "près Hull (Angleterre)"  
Van Heurck 290

 *Synedra gaillonii* Ehrenberg  
United Kingdom (Isle of Man); "Ile de Man (Angleterre)"  
Van Heurck 291

 *Cocconeis dirupta*  
*Nitzschia punctata*  
*Rhabdonema arcuatum*  
*Synedra capensis* \[cf.\]  
*Synedra gaillonii* Ehrenberg  
*Synedra gaillonii* Ehrenberg var. \[unnamed\]  
England (Devon) Plymouth; "Plymouth (Angleterre)"  
Van Heurck 292

 *Synedra investiens* W. Smith  
Scotland (Fife) Kinghorn; "Kinghorn (Angleterre)"  
Van Heurck 293

 *Synedra barbatula* Kützing  
France (Calvados) Arromanches-les-Bains; "Arromanches (France)"   
Van Heurck 294

 *Synedra laevigata* Grunow  
Samoa (Upolu); "Upolu"  
Van Heurck 296

 *Achnanthes lanceolata*  
*Eunotia lunaris*  
*Gomphonema angustatum* var. \[unnamed\]  
*Gomphonema parvulum*  
*Gomphonema subclavatum*  
*Meridion circulare*  
*Staurosira intermedia*  
*Synedra rumpens* Kützing var. *familiaris* Kützing  
*Synedra vaucheriae* var. \[unnamed\]  
Germany (Schleswig-Holstein); "Holstein"   
Van Heurck 296

 *Eunotia arcu*s W. Smith  
*Synedra arcus*  
*Synedra vaucheriae* Kützing  
Wales (Dyfed) Haverfordwest; "Haverfordwest (Angleterre)"  
Van Heurck 297

 *Ceratoneis arcus*  
*Synedra pulchella* Kützing var. *genuina*  
*Synedra pulchella* Kützing var. *lanceolata*  
Scotland (Strathclyde) Arran; "Arran (Angleterre)"  
Van Heurck 298

 *Synedra minutissim*a W. Smith  
*Synedra minutissima* Kützing \[nec\]  
*Synedra pulchella* Kützing var. *lanceolata* O'Meara  
Great Britain; "Angleterre"  
Van Heurck 299

 *Synedra pulchella* Kützing var. *smithii* Brébisson  
Norway; "Norwège"  
Van Heurck 300

 *Diatoma elongatum*  
*Epithemia zebr*a vars. \[unnamed\]  
*Melosira subflexilis*  
*Synedra affinis* var. *subtilis* Grunow  
*Synedra gracilis* W. Smith  
*Synedra gracilis* Kützing \[nec\]  
*Synedra pulchell*a var. *smithii*  
*Synedra pulchella* Kützing var. *saxonica* Kützing  
Scotland (Grampian) Aberdeen; "Aberdeen (Angleterre)"  
Van Heurck 301

 *Synedra affini*s Kützing  
*Synedra affinis* Kützing var. *fasciculata* Kützing  
Great Britain; "Angleterre"  
Van Heurck 302

 *Synedra gigantea* Lobarzewski  
*Synedra undulata* Gregory  
Baltic Sea; "Mer Baltqiue"  
Van Heurck 303

 *Synedra robusta* Ralfs  
Mediterranean Sea; "Mer Mediterranée"  
Van Heurck 304

 *Synedra crystallina* Kützing  
Baltic Sea; "Mer Baltqiue"  
Van Heurck 305

 *Synedra baculus* Gregory  
*Synedra formosa* Hantzsch  
*Synedra superb*a Kützing  
Yugoslavia (Croatia) Split; "Spalato \[on printed register\], Italie \[on slide label\]"   
Van Heurck 306

 *Synedra fulgens* W. Smith var. *conspicua* Grunow  
Great Britain; "Angleterre"  
Van Heurck 307

 *Cocconeis dirupta*  
*Cocconeis scutellum*  
*Nitzschia punctata*  
*Rhabdonema arcuatum*  
*Synedra fulgens* W. Smith var. *anglica*  
*Synedra gaillonii*  
England (Devon) Plymouth; "Plymouth (Angleterre)"  
Van Heurck 308

 *Eunotia exigua*  
*Eunotia mino*r  
*Eunotia tridentula*  
*Fragilaria virescens* Ralfs  
Scotland (Tayside) Clova; "Clova (Angleterre)"  
Van Heurck 309

 *Fragilaria hyalina* Grunow  
England (Humberside) Kingston-upon-Hull; "Hull (Angleterre)"   
Van Heurck 310

 *Asterionella formosa*  
*Cocconeis pediculus*  
*Cymbella cistula*  
*Cymbella helvetica*  
*Cymbella lanceolat*a  
*Encyonema caespitosum*  
*Encyonema paradoxum*  
*Encyonema ventricosum*  
*Fragilaria capucina*  
*Fragilaria smithiana* Grunow  
*Navicula ambigua*  
*Navicula scutelloides*  
*Stephanodiscus astrea*  
*Surirella angusta*  
*Surirella minuta*  
*Surirella panduriformis*  
*Tabellaria flocculosa*  
England (Cheshire); "Cheshire (Angleterre)"  
Van Heurck 311

 *Fragilaria capucina* Desmazières var. *mesolepta* Rabenhorst  
*Melosira varians*  
*Synedra delicatissim*a W. Smith  
*Synedra radians* W. Smith \[nec\]  
*Synedra radians* Kützing  
*Synedra splendens*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 312

 *Fragilaria aequalis* Heiberg  
*Fragilaria capucina* Desmazières var. *aequalis* Grunow  
*Synedra splendens*  
Sweden (Skaraborg) Sandhem; "Sandheim \[!\] \[on printed register\], Allemagne \[on slide label\]  
Van Heurck 313

 *Fragilaria intermedia* Grunow  
*Melosira varians*  
*Meridion circulare*  
Germany (Schleswig-Holstein); "Holstein"  
Van Heurck 314

 *Encyonema ventricosum*  
*Fragilaria mutabilis* (W. Smith) Grunow f. \[unnamed\] \["minores"\]  
*Melosira varians*  
*Meridion circulare*  
Belgium (Brabant) Leuven; "Louvain (Belgique)"  
Van Heurck 315

 *Fragilaria harrisonii* Grunow  
*Odontidium harrisonii*  
England (Humberside) Kingston-upon-Hull; "Hull (Angleterre)"   
Van Heurck 316

 *Fragilaria parasitica* Grunow  
Great Britain (\[?\]) Hauginshaw; "Hauginshaw (Angleterre)"  
Van Heurck 317

 *Cymbella microcephala* Grunow  
*Fragilaria brevistriata* Grunow var. *subcapitat*a Grunow  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique")   
Van Heurck 318

 *Fragilaria crotonensis* Edwards  
Belgium (Brabant) Bruxelles  
Van Heurck 319

 *Actinoptychus undulatusBiddulphia auritaBiddulphia mobiliensisCampylosira cymbelliformis* Grunow  
*Coscinodiscus excentricusCyclotella striataCymatosira belgicaMelosira sulcataMelosira westiiNavicula asperaPleurosigma balticumPleurosigma naviculaceumRhaphoneis rhombusRhaphoneis surirella*  
Belgium (West-Vlaanderen) Blankenberge  
Van Heurck 320  
  
*Licmophora lyngbyei* Grunow  
Netherlands, The (Friesland)  
Van Heurck 321

 *Licmophora lyngbeyiLicmophora lyngbeyi*  
England (Devon) Exmouth  
Van Heurck 322

 *Licmophora flabellata* C. Agardh  
Scotland (Strathclyde) The Cumbraes  
Van Heurck 323

 *Licmophora juergensii* Grunow  
Great Britain  
Van Heurck 324

 *Licmophora oedipus* (Kützing) Grunow  
Norway  
Van Heurck 325

 *Cocconeis dirupta*  
*Cocconeis scutellum* var. *stauroneiformis*  
*Licmophora dalmatica* (Kützing) Grunow  
Scotland (Fife) Saint Andrews; "St-Adrews\[!\] Bathing Place (Angleterre)"  
Van Heurck 326

 *Licmophora ovata* (W. Smith) Grunow  
Adriatic Sea; "Mer Adriatique"  
Van Heurck 327

 *Licmophora tincta* (C. Agardh) Grunow  
Germany (Schleswig-Holstein); "Schleswig"  
Van Heurck 328

 *Denticula nicobarica* Grunow  
Nicobar Islands (Nancowry Island); "Nankoori"   
Van Heurck 329

 *Achnanthes subsessilis*  
*Denticula thermalis* Kützing  
Italy (Veneto) Abano Terme; "Abano (Italie)"  
Van Heurck 330

 *Amphora pediculus*  
*Amphora* sp.  
*Denticula elegans* Kützing var. *lanceolata* Grunow  
*Denticula tenuis*  
*Encyonema caespitosum*  
*Encyonema ventricosum*  
*Navicula elliptica*  
*Navicula viridis*  
*Nitzschia linearis*  
Wales (Dyfed) Neyland; "Neyland (Angleterre)"  
Van Heurck 331

 *Cymbella affinis*  
*Cymbella delicatula*  
*Cymbella gastroides*  
*Denticula tenuis* Kützing  
*Gomphonema intricatu*m W. Smith  
*Navicula elliptica*  
*Nitzschia sinuata*  
*Synedra amphicephala* var. \[unnamed\]  
*Synedra splendens*  
England (Northumberland) Redesdale; "Redesdale (Angleterre)"  
Van Heurck 332

 *Amphora perpusilla*  
*Cymbella affinis*  
*Cymbella cistula*  
*Cymbella helvetica*  
*Cymbella microcephala* f. *parva*  
*Denticula tenuis* Kützing var. *inflata* Grunow  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 333

 *Cymbella affinis*  
*Cymbella cistula*  
*Cymbella parva*  
*Denticula tenuis* Kützing var. *frigida* Grunow  
*Gomphonema constrictum*  
*Gomphonema intricatum*  
*Meridion circulare*  
*Nitzschia denticula*  
*Rhoicosphenia curvata*  
*Synedra affinis var. delicatula GrunowSynedra ulna*  
Sweden (Malmohus) Ortofta; "Ortofta"  
Van Heurck 334

 *Diatoma vulgare* Bory  
*Rhoicosphenia curvata*  
Scotland (Strathclyde) The Cumbraes; Cumbrae (Angleterre)"   
Van Heurck 335

 *Cocconeis pediculus*  
*Cymbella lanceolata*  
*Diatoma vulgare* Bory  
*Diatoma vulgare* Bory var. *distorta*   
*Rhoicosphenia curvata*  
England (Wiltshire) Devizes; "Devizse\[!\] (Angleterre)"  
Van Heurck 336

 *Diatoma elongatu*m C. Agardh  
*Gomphonmea olivaceum*  
*Stephanodiscus hantzschi*i forms \[unnamed\] \[as "formae minutae"\]  
*Surirella minuta*  
*Surirella ovata*  
*Synedra pulchella* var. *splendens*  
*Synedra splendens*  
Belgium (West-Vlaanderen) Nieuwpoort; "Nieuport (Belgique)"   
Van Heurck 337

 *Diatoma elongatum* C. Agardh var. *tenuis*  
Scotland (Stratchlyde) The Cumbraes; "Cumbrae (Angleterre)"   
Van Heurck 338

 *Diatoma grande* W. Smith  
*Diatoma vulgare*  
Scotland (Central) Allan Water; "Allan Water (Angleterre)"  
Van Heurck 339

 *Diatoma hiemale* (Kützing) Heiberg  
*Diatoma hiemale* (Kützing) Heiberg var. *mesodon*  
Belgium (\[?\]) Wiry; "Wiry (Belgique)"\[?\]  
Van Heurck 340

 *Diatoma anceps* (Ehrenberg) Grunow  
*Fragilaria virescens*  
*Gomphonema parvulum*  
*Gomphonema tenellum* Kützing  
*Meridion constrictum*  
Belgium (Luxembourg) Mogimont; "Mogimont \[on printed register\], (Angleterre) \[on slide label and printed register\]"  
Van Heurck 341

 *Achnanthes lanceolata*  
*Diatoma anceps* (Ehrenberg) Grunow var. *anomala* W. Smith  
*Gomphonema angustatum*  
*Meridion constrictum*  
*Stauroneis phoenicenteron* var. \[unnamed\]  
Poland (Silesia); "Silésie"  
Van Heurck 342

 *Achnanthes lanceolata*  
*Gomphonema angustatum*  
*Meridion circulare* C. Agardh  
*Navicula dicephala* Kützing  
*Nitzschia palea*  
*Synedra vaucheriae*  
Belgium (Brabant) Rouge Cloître; "Rouge-Cloître (Belgique)"  
Van Heurck 343

 *Gomphonema angustatum* var. \[unnamed\]  
*Meridion circulare* C. Agardh var. *constrictum*  
*Surirella angusta* f. *curta*  
Belgium (Luxembourg) Fays-les-Veneurs; "Fays-les-Veneurs (Belgique)"  
Van Heurck 344

 *Asterionella formosa* Hassal  
*Melosira varians*  
Belgium (Antwerpen) Antwerp; "Anvers (Belgique)" \[Anvers  
Van Heurck 345

 *Tabellaria fenestrata* Kützing  
*Tabellaria flocculosa*  
Norway (\[?\]) Dovrefjell; "Dovrefields Mts (Norwège)"  
Van Heurck 346

 *Diatoma hiemale* var. *mesodon*  
*Encyonema gracile* f. *parva*  
*Eunotia exigua*  
*Eunotia lunaris*  
*Eunotia tridentula*  
*Fragilaria virescens*  
*Gomphonema parvulum*  
*Meridion constrictum*  
*Navicula hilseana*  
*Tabellaria flocculosa* Kützing var. *crassinervis*  
*Vanheurckia rhomboides*  
Belgium (Luxembourg) Paliseul; "Paliseul (Belgique)"  
Van Heurck 347

 *Achnanthidium flexellum* f. *minuta*  
*Cymbella subaequalis* Grunow var. \[unnamed\]  
*Gomphonema angustatum* var. \[unnamed\]  
*Gomphonema montanum*  
*Navicula cesatii* var. \[unnamed\]  
*Navicula falaisensis* var. \[unnamed\]  
*Nitzschia frustulum* var. *subserians*  
*Nitzschia sinuata*  
*Tetracyclus rupestris* (Braun) Grunow  
Belgium (Namur) Alle; "Alle (Belgique)"  
Van Heurck 348

 *Fragilaria virescens*  
*Melosira arenaria*  
*Melosira crenulata*  
*Stauroneis phoenicenteron*  
*Tetracyclus lacustris*  
*Tetracyclus lacustris* var. *emarginata*  
*Tetracyclus rhombus* (Ehrenberg) Grunow  
United States (Oregon); "Dépot de l'Orégon"  
Van Heurck 349

 *Grammatophora macilenta* \[cf.\]  
*Grammatophora serpentina* Ehrenberg  
*Synedra gaillonii* var. \[unnamed\]  
Northern Ireland (Down) Donaghadee; "Donaghadée (Angleterre)"  
Van Heurck 350

 *Grammatophora angulosa* Greville  
United States (California); "Californie"  
Van Heurck 351

 *Grammatophora marina* Kützing var. *tropica* Kützing  
*Grammatophora oceanica*  
*Grammatophora serpentina*  
*Orthoneis binotata* Grunow  
*Rhoicosphenia curvata* \[as "*Rhoiscophenia*"\]  
England (Devon) Sidmouth; "Sidmouth (Angleterre)"  
Van Heurck 352

 *Grammatophora marina* Kützing var. *macilenta* W. Smith  
Australia (Tasmania); "Terre de Van Dieman"  
Van Heurck 353

 *Grammatophora gibberula* Kützing  
Italy (Campania) Naples; "Naples"  
Van Heurck 354

 *Grammatophora marina* Kützing var. *oceanica* f. *communis*  
Great Britain; "Angleterre"  
Van Heurck 355

 *Gomphonema exiguum*  
*Grammatophora marina* Kützing var. *oceanica* f. *vulgaris*  
*Synedra investiens* W. Smith  
Belgium (West-Vlaanderen) Nieuwpoort; "Nieuport (Belgique)"  
Van Heurck 356

 *Grammatophora oceanica*  
*Licmophora lyngbyei* (Kützing) Grunow  
*Striatella delicatula* Grunow  
*Synedra investiens* W. Smith  
Belgium (West-Vlaanderen) Oostende; "Ostende\[!\] (Belgique)"  
Van Heurck 357

 *Achnanthes seriata*  
*Cymbosira agardhii*  
*Homeocladia vidovichii* var. \[unnamed\]  
*Rhabdonema adriaticum*  
*Striatella interrupta* Heiberg  
*Striatella unipunctata*  
Great Britain; "Angleterre"  
Van Heurck 358

 *Striatella unipunctata* C. Agardh  
Baltic Sea; "Mer Baltique"  
Van Heurck 359

 *Grammatophora marina* var. *tropica*  
*Rhabdonema adriaticum* Kützing  
Italy (Campania) Sorrento; "Sorrente (Italie)"  
Van Heurck 360

 *Rhabdonema arcuatum* Kützing  
Great Britain; "Angleterre"  
Van Heurck 361

 *Rhabdonema minutum* Kützing  
England (Sussex); "Sussex (Angleterre)"  
Van Heurck 362

 *Cymatopleura elliptica* W. Smith  
England, Thames River; "Thames (Angleterre)"  
Van Heurck 363

 *Cymatopleura elliptica* var. *hibernica* W. Smith  
Northern Ireland (Antrim) Toome; "Toome Bridge deposit (Irlande)"  
Van Heurck 364

 *Cymatopleura apiculata* W. Smith  
*Cymatopleura solea* Brébisson forms \[unnamed\]  
*Nitzschia hungarica*  
*Nitzschia linearis*  
*Surirella ovata* var. \[unnamed\]  
Belgium (Brabant) Ixelles; "Ixelles (Belgique)"  
Van Heurck 365

 *Podocystis adriatica* Kützing  
Italy; "Italie"  
Van Heurck 366

 *Hantzschia amphioxys* Grunow  
Belgium (Brabant) Ixelles; "Ixelles (Bruxelles)\[!\]"  
Van Heurck 367

 *Amphiprora paludosa*  
*Amphora ovalis* var. *affinis*  
*Hantzschia amphioxys* Grunow var. *vivax* Grunow f. *maxima*  
*Navicula crucicula*  
*Navicula viridis* var. \[unnamed\]  
*Nitzschia vitrea*  
England (Humberside) Kingston-upon-Hull; "Hull (Angleterre)"  
Van Heurck 368

 *Druridgea geminata*  
*Hantzschia marina* Grunow  
*Hantzschia virgata*  
*Navicula aestiva*  
*Navicula clepsydra*  
*Navicula granulata*  
*Navicula lineata* Donkin  
*Navicula northumbrica* Donkin  
*Navicula palpebralis*  
*Navicula smithii*  
*Navicula trevelyanaNitzschia spathulata*  
England (Northumberland) Cresswell; "Creswell (Angleterre)"  
Van Heurck 369

 *Amphiprora didyma*  
*Hantzschia virgata* (Roper) Grunow var. *intermedia*  
Great Britain; "Angleterre"  
Van Heurck 370

 *Navicula marina*  
*Nitzschia naviculari*s (Brébisson) Grunow  
*Nitzschia punctata*  
*Nitzschia tryblionella*  
*Pleurosigma hippocampus*  
Baltic Sea; "Mer Baltique"  
Van Heurck 371

 *Amphiprora alata* var. \[unnamed\]  
*Navicula cyprinus*  
*Nitzschia acuminata*  
*Nitzschia apiculata*  
*Nitzschia punctata* (W. Smith) Grunow  
*Nitzschia sigma*  
*Surirella gemma*  
England (Lancashire); "Lancashire (Angleterre)"  
Van Heurck 372

 *Amphora ovalis*  
*Navicula elliptica*  
*Navicula peregrina*  
*Nitzschia dubia*  
*Nitzschia paradoxa*  
*Nitzschia tryblionella* Hantzsch  
*Nitzschia vitrea*  
England (Humberside) Kingston-upon-Hull; "Hull (Angleterre)"  
Van Heurck 373

 *Nitzschia tryblionella* Hantzsch var. *maxima*  
Australia; "Australie"  
Van Heurck 374

 *Nitzschia tryblionella* Hantzsch var. *levidensis* W. Smith  
*Synedra affinis* Kützing var. \[unnamed\]  
Wales (Dyfed) Neyland; "Neyland près Haverfordwest (Angleterre)"  
Van Heurck 375

 *Nitzschia angustata* Grunow var. *curta*  
*Nitzschia angustata* Grunow var. *subconstricta*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 376

 *Nitzschia panduriformis* Gregory var. *lata*  
North America; "Amér\[ique\] Septentrionale"  
Van Heurck 377

 *Cymbella gastroides*  
*Navicula dubia*  
*Navicula gibba*  
*Navicula nobilis*  
*Navicula viridis*  
*Nitzschia plana* W. Smith  
*Stauroneis gracilis*  
*Surirella elegans*  
*Surirella nobilis*  
*Surirella splendida*  
Scotland (Strathclyde) Prestwick; Prestwick (Angleterre)"  
Van Heurck 378

 *Nitzschia acuminata* W. Smith  
North Sea; "Mer du Nord"  
Van Heurck 379

 *Nitzschia hungarica* Grunow  
Belgium (Brabant) Schaerbeek; "Schaerbeeck\[!\] (Belgique)"   
Van Heurck 380

 *Nitzschia circumsuta* J.W. Bailey  
Sweden; "Suède"  
Van Heurck 381

 *Achnanthes lanceolata*  
*Amphora ovali*s var. *affinis*  
*Cymatopleura solea*  
*Navicula dicephala*  
*Navicula elliptica*  
*Navicula viridis*  
*Nitzschia dubia* W. Smith  
*Nitzschia linearis*  
*Nitzschia vitrea*  
*Surirella ovalis*  
*Surirella pinnata*  
Scotland (Lothian) Edinburgh; "Edimbourg\[!\] (Ecosse)"   
Van Heurck 382

 *Navicula brebissonii*  
*Navicula viridis* var. *commutata*  
*Nitzschia hungarica*  
*Nitzschia serians* (Brébisson) Rabenhorst  
France (Calvados) Falaise; "Falaise (France)"  
Van Heurck 383

 *Nitzschia denticula* Grunow  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 384

 *Epithemia gibba*  
*Epithemia* sp. *Nitzschia sinuata* Grunow  
Belgium (Luxembourg) Frahan; "Frahan (Belgique)"  
Van Heurck 385

 *Cymbella affinis*  
*Cymbella microcephala*  
*Encyonema caespitosum*  
*Encyonema ventricosum*  
*Nitzschia sinuata* Grunow var. *tabellaria* Grunow  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 386

 *Nitzschia scalaris* W. Smith  
Samoa; "Iles Samoa"  
Van Heurck 387

 *Eupodiscus commutatus* Grunow  
*Nitzschia paradoxa* Grunow  
*Nitzschia sigma* var. \[unnamed\]  
*Pleurosigma strigilis*  
*Surirella gemma*  
Germany (Schleswig-Holstein); "Schleswig"  
Van Heurck 388

 *Amphora commutata*  
*Navicula amphisbaena* var. *subsalina*  
*Navicula cyprinus*  
*Nitzschia brebissonii*  
*Nitzschia hungarica*  
*Nitzschia vitrea*  
*Nitzschia vivax* W. Smith  
*Stauroneis gregori*i  
England (Humberside) Kingston-upon-Hull; "Hull (Angleterre)"  
Van Heurck 389

 *Cocconeis excentricus*  
*Nitzschia spathulata*  
*Nitzschia spathulata* Brébisson  
*Pleurosigma arcuatum* Donkin  
Scotland (Strathclyde) Carmarthen; "Caermarthen\[!} (Angleterre)"  
Van Heurck 390

 *Nitzschia dissipata* Grunow  
Belgium (Brabant) Vallée de Josaphat, near Brussels; "Vallée de Josphat près Bruxelles (Belgique)"  
Van Heurck 391

 *Navicula cuspidata*  
*Nitzschia linearis*  
*Nitzschia sigmoidea* W. Smith  
Belgium (Brabant) Bruxelles; Bruxelles (Belgique)"  
Van Heurck 392

 *Nitzschia brebissonii*  
Germany (Schleswig-Holstein); "Holstein"  
Van Heurck 393

 *Achnanthes brevipes*  
*Achnanthes subsessilis*  
*Navicula didyma*  
*Navicula directa*  
*Navicula* sp.  
*Nitzschia sigma* W. Smith  
*Nitzschia sigma*  
*Schizonema crucigerum*  
*Surirella fastuosa*  
Scotland (Lothian) Granton; "Granton Quarry (Angleterre)"  
Van Heurck 394

 *Nitzschia apiculata*  
*Nitzschia hungarica*  
*Nitzschia sigma* W. Smith var. *genuina*  
*Nitzschia sigma* W. Smith var. \[unnamed\]  
*Pleurosigma angulatum*  
*Pleurosigma strigosum*  
*Surirella striatula*  
France; "France"  
Van Heurck 395

 *Cymatopleura solea* var. *apiculata*  
*Nitzschia dubia*  
*Nitzschia sigma* W. Smith var. *rigidula* Grunow  
*Pleurosigma spenceri* var. \[unnamed\]  
*Surirella ovata*  
Belgium (Brabant) Rouge Cloître; "Rouge-Cloître (Belgique)"  
Van Heurck 396

 *Nitzschia apiculata*  
*Nitzschia lanceolata* f. *minor*  
*Nitzschia sigma* W. Smith var. *sigmatella* Grunow  
Wales (Dyfed) Neyland; "Neyland (Angleterre)"  
Van Heurck 397

 *Nitzschia obtusa* W. Smith  
France (Calvados) Villerville, near Honfleur; "Villerville près Honfleur (France)"  
Van Heurck 398

 *Nitzschia nana* Grunow  
*Nitzschia obtusa* var. *nana*  
Wales (Dyfed) Haverfordwest; "Haverfordwest (Angleterre)"  
Van Heurck 399

 *Nitzschia obtusa* W. Smith  
*Nitzschia obtusa* W. Smith var. *brevissima* Grunow  
Belgium (Antwerpen) Antwerp; "Pilotis de l'Escaut à Anvers (Belgique)"  
Van Heurck 400

 *Gomphonema commutatum* \[cf.\]  
*Gomphonema longiceps* Ehrenberg var. \[unnamed\]  
*Gomphonema montanum* \[cf.\]  
*Melosira crenulata*  
*Navicula major* var. *mesogongyla* Ehrenberg  
*Navicula sculpta*  
*Navicula viridis* var. \[unnamed\]  
*Nitzschia spectabilis* Ralfs  
Czechoslovakia (Zapodocesky) Frantiskovy-Lazne; "Franzenbad (Bohême)"  
Van Heurck 401

 *Epithemia succincta*  
*Navicula cyprinus*  
*Navicula lineata* Donkin  
*Nitzschia vitrea* Norman var. *major*  
*Scoliopleura convexa*  
England (Northumberland) Coquet River; "Coquet Mouth (Angleterre)"  
Van Heurck 402

 *Nitzschia linearis* W. Smith var. *major*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 403

 *Nitzschia linearis* W. Smith  
*Nitzschia linearis* W. Smith forms \[unnamed\] \[as "formae breviores"\]  
Belgium (Brabant) Bruxelles; Bruxelles (Belgique)"  
Van Heurck 404

 *Nitzschia dubia* var. *scotica* Grunow  
*Nitzschia linearis* W. Smith var. *subsigmoidea*  
Scotland (Strathclyde) Glasgow; "Glasgow (Ecosse)"  
Van Heurck 405

 *Navicula radiosa*  
*Nitzschia linear*is W. Smith var. *tenuis*  
*Nitzschia paradoxa*  
*Nitzschia tryblionella*  
*Pleurosigma acuminatum* (Kützing) Grunow  
*Pleurosigma spenceri*  
England (Somerset) Minehead; "Minehead (Somerset, Angleterre)"  
Van Heurck 406

 *Nitzschia lanceolata* W. Smith  
France (Calvados) Courseulles-sur-Mer; "Courseules\[!\] (France)"  
Van Heurck 407

 *Nitzschia amphibia* Grunow var. *acutiuscula* forms \[unnamed\] \[as "*amphilia*", as "formae minutiae"\]  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 408

 *Nitzschia amphibia* Grunow  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 409

 *Nitzschia amphibia*  
*Nitzschia frustulum* Grunow var. *tenella*  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 410

 *Nitzschia palea* W. Smith f. *minor*  
England (Wiltshire) Devizes; "Devizes, Angleterre"  
Van Heurck 411

 *Cocconeis pediculus*  
*Gomphonema tenellum* Kützing  
*Nitzschia palea* W. Smith var. *debilis* Kützing f. *angustissima*  
Belgium (Antwerpen) Antwerp, "Anvers"  
Van Heurck 412

 *Nitzschia minuta* Bleisch  
*Nitzschia palea* W. Smith var. *minuta*  
Belgium (Luxembourg) Bouillon; "Bouillon (Belgique)"  
Van Heurck 413

 *Nitzschia ovalis* Arnott  
England (Durham); "Durham (Angleterre)"  
Van Heurck 414

 *Nitzschia acicularis* W. Smith  
Scotland (Strathclyde) Corrygills Point; "Corrieghills (Angleterre)"  
Van Heurck 415

 *Amphiprora duplex* \[as "*Amphiphrora*"\]  
*Amphora laevissima* var. *perminuta* Grunow  
*Amphora salina* W. Smith  
*Amphora scotica* Cleve f. *minor*  
*Eupodiscus weissflogii* Grunow  
*Navicula salinarum* Grunow  
*Nitzschia arcuata* Gregory var. *subarcuata* Grunow  
*Nitzschia closterium* W. Smith  
*Nitzschia sigma* var. diminuta Grunow  
*Synedra amphicephala* Grunow var. *austriaca* Grunow  
Germany (Schleswig-Holstein); "Schleswig"  
Van Heurck 416

 *Cylindrotheca gracilis* Grunow  
*Navicula pygmaea* Kützing  
Germany (Schleswig-Holstein) Wedel; "Wedel (Holstein)"  
Van Heurck 417

 *Surirella robusta* Ehrenberg  
Sweden; "Suède"  
Van Heurck 418

 *Cymatopleura solea*  
*Surirella elegans* Grunow  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 419

 *Eunotia pectinalis* var. *undulata*  
*Navicula gibba*  
*Navicula serians*  
*Navicula viridis*  
*Surirella biseriata* Brébisson  
*Vanheurckia rhomboides*  
Great Britain; "Angleterre"  
Van Heurck 420

 *Cymatopleura solea*  
*Nitzschia angustata* var. *curta*  
*Nitzschia subconstrictaSurirella biseriata* Brébisson var. minor  
Belgium (Brabat) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 421

 *Surirella splendida* Ehrenberg  
Germany (Schleswig-Holstein); "Holstein"  
Van Heurck 422

 *Surirella striatula* Turpin  
Denmark (Tonder) Tonder; "Tondern, (Allemagne)"  
Van Heurck 423

 *Amphora ovalis* var. *affinis*  
*Cymatopleura solea* var. *apiculata*  
*Cymatopleura solea* var. *parallela*  
*Fragilaria parasitica* var. *subconstricta* Grunow  
*Navicula humilis*  
*Navicula oblonga*  
*Nitzschia linearis*  
*Nitzschia sigmoidea*  
*Nitzschia tenuis*  
*Stauroneis smithii*  
*Surirella crumena* Brébisson  
Belgium (Brabant) La Hulpe; "La Hulpe (Belgique)"  
Van Heurck 424

 *Surirella ovalis* Brébisson  
Belgium (Brabant) St-Josse-ten-Noode, near Bruxellles; "St-Josse-ten-Noode près Bruxelles (Belgique)"  
Van Heurck 425

 *Surirella ovata* Kützing var. \[unnamed\]  
*Surirella suevica* \[cf.\] Zeller  
France; "France"  
Van Heurck 426

 *Surirella minuta* \[cf.\]  
*Surirella ovata* Kützing var. *minor*  
Wales (Dyfed) Neyland; "Neyland (Angleterre)"  
Van Heurck 427

 *Nitzschia palea* var. *debilis* Grunow  
*Surirella angusta*  
*Surirella minuta* Brébisson  
Wales (Dyfed) Neyland; "Neyland (Angleterre)"  
Van Heurck 428

 *Gomphonema angustatum*  
*Navicula gibba*  
*Navicula limosa*  
*Navicula mesolepta* var. *stauroneiformis*  
*Surirella angusta*  
*Surirella pinnata* W. Smith  
Poland (Silesia); "Silésie"  
Van Heurck 429

 *Hantzschia amphioxys* f. *minor*  
*Nitzschia palea* var. *minuta*  
*Surirella angusta*  
*Surirella pinnata* W. Smith var. *panduriformis* (W. Smith) \[Van Heurck\]  
Great Britain; "Angleterre"  
Van Heurck 430

 *Amphiprora paludosa*  
*Melosira nummuloides*  
*Navicula crucicula*  
*Navicula cyprinus*  
*Navicula pygmae*a Kützing  
*Nitzschia apiculata*  
*Nitzschia epithemioides*  
*Nitzschia hungarica*  
*Nitzschia sigma* var. *rigida*  
*Nitzschia vitrea* var. *salinarum*  
*Surirella sal*ina (W. Smith) \[Van Heurck\]  
England (London) Woolwich; "Woolwich (Angleterre)"  
Van Heurck 431

 *Surirella fastuosa* Ehrenberg  
North America; "Amér\[ique} Sept\[entrionale}"  
Van Heurck 432

 *Navicula cyprinus*  
*Nitzschia acuminata*  
*Nitzschia sigma* \[var?\]"genuina"  
*Plagiotropis vitrea*  
*Pleurosigma strigosum*  
*Pleurosigma wansbeckii* Donkin  
*Surirella gemm*a Ehrenberg  
England (Essex) Harwich; "Harwich (Angleterre)"  
Van Heurck 433

 *Cymatopleura elliptica*  
*Cymatopleura* sp.  
*Surirella biseriata*  
*Surirella spiralis* Kützing  
Belgium (Brabant) Diegem; "Dieghem\[!\] (Belgique)"   
Van Heurck 434

 *Campylodiscus clypeus* Ehrenberg  
*Nitzschia spectabilis*  
Czechoslovakia (Zapodocesky) Soos; \[?\]; "Soos près Franzenbad (Bohême)"  
Van Heurck 435

 *Campylodiscus bicostatus* Grunow  
*Mastogloia dansei*  
*Mastogloia dansei* var. \[unnamed\]  
*Mastogloia smithii*  
South Africa; "Afrique Mérid\[inonale\]"  
Van Heurck 436

 *Campylodiscus echineis* Ehrenberg  
North Sea; "Mer du Nord"  
Van Heurck 437

 *Campylodiscus thuretii* Brébisson  
Baltic Sea; "Mer Baltique"  
Van Heurck 438

 *Campylodiscus thuretii* Brébisson f. *parva*  
*Navicula liber*  
England (Merseyside) Birkenhead; "Birkenhead (Angleterre)"  
Van Heurck 439

 *Campylodiscus costatus*W. Smith  
*Campylodiscus hibernicus* Ehrenberg  
*Cymatopleura elliptica*  
*Cymatopleura elliptica* var. *rhomboidea*  
*Cymbella gastroides* forms \[unnamed\] \[as "formae majores"\]  
*Navicula major*  
*Navicula nobilis*  
*Navicula viridis*  
*Surirella elegans*  
Germany (Leipzig) Leipzig; "Leizig"  
Van Heurck 440

 *Campylodiscus noricus* Ehrenberg  
Belgium (Brabant) Rouge-Cloître; "Rouge-Cloître (France)"  
Van Heurck 441

 *Rhizosolenia styliformis* Brightwell  
*Thalassiothrix longissima*  
\[No locality\]  
Van Heurck 442

 *Rhizosolenia alata* Brightwell var. *gracillima*  
Sweden; "Suède"  
Van Heurck 443

 *Rhizosolenia imbricata* Brightwell var. *striata*  
West Indies (Windward Islands) Saint Vincent; "St-Vincent"  
Van Heurck 444

 *Bacteriastrum varians* Lauder  
Indonesia (Java); "Java"  
Van Heurck 445

 *Chaetoceros armatum* West  
Scotland (Tayside) Firth of Tay; "Dans le Tay (Angleterre)" (Angleterre"  
Van Heurck 446

 *Pyxilla carinifera* Grunow  
Denmark (Thisted) Mors; "Ile de Mors (Jutland)"  
Van Heurck 447

 *Thalassiosira nordenskioldii* Cleve  
Davis Strait; "Détroit de Davis"  
Van Heurck 448

 *Omphalotheca jutlandica* Grunow  
Denmark (Thisted) Mors; "Ile de Mors (Jutland)  
Van Heurck 449

 *Omphalotheca jutlandica* Grunow var. *minor*  
Denmark (Thisted) Mors; "Ile de Mors (Jutland)"   
Van Heurck 450

 *Pterotheca aculeifera* Grunow  
Denmark (Thisted) Mors; "Ile de Mors (Jutland)"   
Van Heurck 451

 *Trochosira spinosa* Kitton var. *ornata*  
Denmark (Thisted) Mors; "Ile de Mors (Jutland)"  
Van Heurck 452

 *Stephanopyxis corona* Grunow  
North America; "Amér\[ique\] Sept\[entrionale\]"  
Van Heurck 453

 *Hyalodiscus stelligera* J.W. Bailey  
*Podosira macul*ata W. Smith  
North Sea; "Mer du Nord"  
Van Heurck 454

 *Grammatophora serpentina*  
*Podosira montagnei* Kützing  
*Rhabdonema arcuatum*  
*Synedra gaillonii*  
England (Devon) Sidmouth; "Sidmouth (Angleterre)"  
Van Heurck 455

 *Podosira adriatica* Van Heurck  
*Podosira adriatica* Grunow var. *delicatula*  
*Podosira hormoides*  
Australia; "Australie"  
Van Heurck 456

 *Melosira nummuloides* C. Agardh  
Scotland (Lothian) Granton; "Granton Quarry, Angleterre"  
Van Heurck 457

 *Melosira borreri* Greville  
Great Britain; "Angleterre"  
Van Heurck 458

 *Melosira varians Agardh*  
Germany; "Allemagne"  
Van Heurck 459

 *Melosira juergensii* C. Agardh  
*Melosira juergensi*i C. Agardh var. *subangularis* Grunow  
*Nitzschia paradoxa*  
Belgium (Antwerpen) Austruweel, near Antwerp; "Austruweel près d'Anvers (Belgique)"  
Van Heurck 460

 *Achnanthes lanceolata*  
*Diatoma hiemale*  var. *mesodon*  
*Melosira distans* Kützing  
*Navicula radiosa*  
*Synedra splendens*  
Scotland (Grampian) Braemar; "Braemar (Angleterre)"  
Van Heurck 461

 *Cocconeis placentula*  
*Cymbella hebridica* Gregory  
*Epithemia gibba*  
*Eunotia arcus*  
*Eunotia gracilis*  
*Eunotia incisa*  
*Eunotia major* var. *bidens*  
*Eunotia pectinalis* var. *undulata*  
*Eunotia robusta* var. *tetraodon*  
*Fragilaria virescens* var. *exigua*  
*Gomphonema acuminatum*  
*Gomphonema gracile* var. \[unnamed\]  
*Melosira distans* Kützing var. *nivalis*  
*Navicula brachysira*  
*Navicula serians*  
*Navicula stomatophora*  
*Navicula viridis* var. *commutata*  
*Stauroneis gracilis*  
*Tabellaria fenestrata*  
*Tabellaria flocculosa*  
*Vanheurckia rhomboides*  
Scotland (Strathclyde) Mull; "Dépot de Mull (Ecosse)"  
Van Heurck 462

 Melosira granulata Ralfs  
Germany (Cottbus) Lausitz; "Lausitz"  
Van Heurck 463

 *Melosira crenulata* Kützing  
*Melosira crenulata* Kützing var. *tenuis*  
Belgium (Brabant) Rouge-Cloître; "Rouge-Cloître (France)"  
Van Heurck 464

 *Hantzschia amphioxys* var. *belgica* Grunow  
*Melosira roeseana* Rabenhorst  
Belgium (Luxembourg) Frahan; "Frahan (Belgique)  
Van Heurck 465

 *Melosira roeseana* var. *dendroteres*  
\[No locality\]  
Van Heurck 466

 *Melosira roesean*a var. *epidendron*  
Scotland (Grampian) Aberdeen; "Aberdeen (Angleterre)"  
Van Heurck 467

 *Melosira arenaria* Moore  
Belgium (Namur) Alle; "Alle (Belgique)"  
Van Heurck 468

 *Fragilaria virescens* var. *exigua* Grunow  
*Melosira dickiei* Kützing  
Scotland (Grampian) Aberdeen; "Aberdeen (Angleterre)"  
Van Heurck 469

 *Melosira sulcata* Kützing  
United States (Virginia) Richmond; "Richmond (Etats-Unis)"  
Van Heurck 470

 *Coscinodiscus decipiens* Grunow  
*Cyclotella meneghiniana*  
*Navicula crucicula* var. \[unnamed\]  
*Navicula salinarum*  
*Nitzschia apiculata*  
*Nitzschia hungarica*  
*Nitzschia sigma* var. *rigida*  
*Pleurosigma brebissonii* Grunow  
*Pleurosigma fasciola* f. *media*  
*Pleurosigma hippocampus*  \[as "Hippocampos\[!}"\]  
England (London) North Woolwich; "North Woolwich (Angleterre)"   
Van Heurck 471

 *Amphora arenaria*  
*Druridgea geminata* Donkin  
*Hantzschia marina*  
*Hantzschia virgata*  
*Navicula aestiva*  
*Navicula cancellata*  
*Navicula clepsydra*  
*Navicula liber*  
*Navicula lineata*  
*Navicula palpebralis*  
England (Northumberland) Cresswell; "Cresswell (Angleterre)"  
Van Heurck 472

 *Melosira sol* Kützing  
United States (California); "Californie"  
Van Heurck 473

 *Cyclotella striata* Grunow var. *stylorum*  
Brazil; "Brésil"  
Van Heurck 474

 *Achnanthidium flexellum* var. \[unnamed\]  
*Amphora ovalis*  
*Cyclotella comta* Kützing var. *radiosa* Grunow  
*Cymbella cistula* f. \[unnamed\] Grunow \[as "formae longiores"\]  
*Cymbella helvetica* var. \[unnamed\]  
*Cymbella turgidula* var. *brevis* Grunow  
*Denticula tenuis*  
*Encyonema caespitosum*  
*Epithemia gibba*  
*Epithemia ocellata*  
*Epithemia sorex*  
*Gomphonema acuminatum*  
*Gomphonema intricatum*  
*Navicula elliptica*  
*Navicula lacustris*  
*Navicula latiuscula* Kützing  
*Navicula radiosa*  
*Nitzschia angustata*  
*Tabellaria fenestrata*  
*Tabellaria flocculosa*  
Scotland (Tayside) Killiecrankie; "Loch vach, Killie Krankie, 1400 pieds d'élévation (Angleterre)"  
Van Heurck 475

 *Cyclotella operculata* Kützing var. *mesoleia*  
*Cymbella cistula*  
*Cymbella helvetica* var. *scotica* Grunow  
*Synedra capitata*  
England (Humberside) Kingston-upon-Hull; "Hull (Angleterre)"  
Van Heurck 476

 *Cyclotella kuetzingiana* Chauvin \[as "kützingiana"\]  
France (Calvados) Falaise; "Falaise (France)"  
Van Heurck 477

 *Cyclotella meneghiniana* Kützing  
Germany; "Allemagne"  
Van Heurck 478

 *Cyclotella meneghiniana* Kützing f. *minor*  
*Navicula lanceolata* Kützing var. \[unnamed\]  
*Nitzschia linearis* f. *minor*  
*Nitzschia palea*  
*Synedra acus* Kützing  
Belgium (Brabant) St-Josse-ten-Noode; "St. Josse-ten-Noode, Bruxelles (Belgique)"  
Van Heurck 479

 *Cyclotella meneghiniana* Kützing var. *rectangulata* Brébisson  
*Synedra delicatissima* W. Smith  
*Synedra* sp.  
*Synedra ten*era W. Smith  
France (Calvados) Falaise; "Falaise (France)"  
Van Heurck 480

 *Cocconeis placentula*  
*Cymatopleura hibernica*  
*Cymbella cistula*  
*Cymbella helvetica*  
*Epithemia sorex*  
*Epithemia turgida*  
*Epithemia zebra*  
*Melosira crenulata*  
*Navicula affinis*  
*Navicula dicephala*  
*Navicula elliptica* var. *subconstricta*  
*Navicula gentilis*  
*Navicula gibba*  
*Navicula limosa*  
*Navicula major*  
*Navicula mesolepta*  
*Navicula viridis*  
*Pleurosigma attenuatum*  
*Stauroneis gracilis*  
*Stauroneis phoenicenteron*  
*Stephanodiscus astrea* Grunow  
*Surirella biseriata*  
*Surirella caledonica* Ehrenberg  
*Surirella splendida*  
*Surirella turgida* W. Smith  
Northern Ireland (Antrim) Toome; "Dépot de Toome Bridge (Irlande)"  
Van Heurck 481

 *Stephanodiscus hantzschianus* Grunow  
Belgium (Brabant) Bruxelles; "Bruxelles (Belgique)"  
Van Heurck 482

 *Cyclotella bodanica* \[cf.\]  
*Cyclotella comta Ehrenberg*  
*Stephanodiscus niagarae* Ehrenberg  
United States, Lake Erie; "Lac Erié (Amér\[ique\] Septentrionale\]"  
Van Heurck 483

 *Achnanthidium flexellum*  
*Cyclotella comta* var. \[unnamed\]  
*Cymbella helvetica*  
*Cymbella norvegica*  
*Epithemia sorex*br> *Eunotia arcus*  
*Eunotia impressa*  
*Eunotia pectinalis* var. *gracilis* \[See Patrick & Reimer 1966, pl. 12, fig. 14\]  
*Eunotia uncinata*  
*Gomphonema acuminatum*  
*Gomphonema intricatum*  
*Navicula cesatii*  
*Navicula cocconeiformis*  
*Navicula divergens*  
*Navicula firma*  
*Navicula gibba*  
*Navicula limosa*  
*Navicula major*  
*Navicula radiosa*  
*Navicula viridis*  
*Stephanodiscus astrea* Grunow var. *minutula*  
*Tabellaria fenestrata*  
*Vanheurckia rhomboides*  
Great Britain; "Angleterre"  
Van Heurck 484

 *Isthmia nervosa* Kützing  
Northern Ireland (Antrim) Glenarm Bay; "Glem\[!\] Arm Bay (Irlande)"  
Van Heurck 485

 *Isthmia enervis* Ehrenberg  
Channel Islands (Jersey); "Jersey (Angleterre)"  
Van Heurck 486

 *Biddulphia pulchella* Gray  
France; "France"  
Van Heurck 487

 *Biddulphia aurita* Brébisson  
North Sea; "Mer du Nord"  
Van Heurck 488

 *Biddulphia rhombus* Ehrenberg  
England (Merseyside) Liverpool; "Liverpool (Angleterre)"  
Van Heurck 489

 *Actinoptychus undulatus*  
*Aulacodiscus argus*  
*Auliscus sculptus*  
*Biddulphia rhombus* var. *irregularis*  
*Biddulphia rhombus* var. *tetragona* \[as "4-gona"\]  
*Biddulphia rhombus* var. *trigona* Cleve  
*Campylodiscus echineis*  
*Eupodiscus argus*  
*Eupodiscus commutatus* Grunow  
*Melosira sulcata*  
*Scoliopleura tumida*  
*Triceratium favus*  
*Triceratium membranaceum* Brightwell  
*Triceratium striolatum* Ehrenberg  
Germany (Schleswig-Holstein); "Schleswig"  
Van Heurck 490

 *Biddulphia roperiana* Greville  
Australia; "Australie"  
Van Heurck 491

 *Biddulphia granulata* Roper \[as "Röper"\]  
North Sea; "Mer du Nord"  
Van Heurck 492

 *Biddulphia baileyi* W. Smith  
*Biddulphia mobiliensis* Grunow  
Germany (Niedersachsen) Cuxhaven; "Cuxhaven (Angleterre)\[!}"  
Van Heurck 493

 *Biddulphia pulchella*  
*Biddulphia reticulata* Roper  
Mediterranean Sea; "Mediterranée"  
Van Heurck 494

 *Cerataulus turgidus* Ehrenberg  
Australia; "Australie"  
Van Heurck 495

 *Cerataulus laevis* Ralfs  
East Indies; "Indes Orientales"  
Van Heurck 496

 *Cerataulus smithii* Ralfs  
North Sea; "Mer du Nord"  
Van Heurck 497

 *Goniothecium odontella* Ehrenberg var. *danica*  
Denmark (Thisted) Mors; "Ile de Mors (Jutland)"  
Van Heurck 498

 *Dicladia capreolus* Ehrenberg  
Chile (Tarapaca); "Guano de Pèrou"  
Van Heurck 499

 *Triceratium favus* Ehrenberg  
Germany (Niedersachsen) Cuxhaven; "Cuxhaven (Angleterre)"  
Van Heurck 500

 *Triceratium antediluvianum* Ehrenberg  
Channel Islands (Guernsey); "Guernsey (Angleterre)"  
Van Heurck 501

 *Triceratium sculptum* Shadbolt  
Adriatic Sea; "Mer Adriatqiue"  
Van Heurck 502

 *Biddulphia baleana* Ehrenberg  
Norway (Svalbard); "Spitzberg"   
Van Heurck 503

 *Triceratium campechianum* Grunow  
Gulf of Mexico (Campeche Bay); "Baie de Campêche (Mexique)"  
Van Heurck 504

 *Triceratium alternans* Ehrenberg  
Chile (Tarapaca); "Guano de Pérou"  
Van Heurck 505

 *Lithodesmium undulatum* Ehrenberg  
Germany (Schleswig-Holstein); "Holstein"  
Van Heurck 506

 *Auliscus sculptus* Ralfs  
North Sea; "Mer du Nord"  
Van Heurck 507

 *Coscinodiscus apiculatus* var. *ambigua* Grunow  
*Coscinodiscus asteromphalus* var. *hybrida*  
*Eupodiscus argus* Ehrenberg  
Germany (Niedersachsen) Cuxhaven; "Cuxhaven"  
Van Heurck 508

 *Eupodiscus radiatus* J.W. Bailey  
South America; "Amérique méridonale"  
Van Heurck 509

 *Stictodiscus angulatus* Grunow  
Denmark (Thisted) Mors; "Ile de Mors (Jutland)"  
Van Heurck 510

 *Actinoptychus splendens* (Shadboldt) Ralfs  
Germany (Niedersachsen) Cuxhaven; "Cuxhaven"  
Van Heurck 511

 *Actinoptychus splendens* Ralfs var. *halionyx* Grunow  
Brazil; "Brésil"  
Van Heurck 512

 *Actinoptychus heliopelta* Grunow  
North America; "Amér\[ique Septent\[rionale\]"  
Van Heurck 513

 *Actinoptychus undulatus* Ehrenberg  
North Sea; "Mer du Nord"  
Van Heurck 514

 *Polymyxus coronalis* L.W. Bailey  
South America; "Amér\[ique\] mérid\[ionale\]"  
Van Heurck 515

 *Actinocyclus ralfsii* W. Smith var. \[unnamed\]  
North Sea; "Mer du Nord"  
Van Heurck 516

 *Actinocyclus ehrenbergii* \[cf.\]  
*Actinocyclus ralfsii* W. Smith var. \[unnamed\]  
*Amphora marina*  
*Cocconeis dirupta* Gregory  
*Navicula aspera*  
*Navicula crabro*  
*Surirella fastuosa*  
Scotland (Strathclyde) Corrygills Point; "Corrieghills, Arrau\[!\] (Angleterre)"  
Van Heurck 517

 *Actinocyclus ehrenbergi*i Ralfs  
*Actinocyclus ralfsii*  
*Actinocyclus subtilis*  
*Cocconeis dirupta*  
*Navicula aspera*  
*Surirella fastuosa*  
Scotland (Strathclyde) Corrygills Point; "Corrieghills, Arrau\[!\] (Angleterre)"  
Van Heurck 518

 *Actinocyclus subtilis* Ralfs  
England (Devon) Plymouth; "Plymouth (Anlgeterre)"  
Van Heurck 519

 *Achnanthes subsessilis*  
*Actinocyclus subtilis*  
*Actinocyclus subtilis* var. *subdivisa* Grunow  
*Actinocyclus tenuissima* \[cf.\] \[as "*tenuissimus\]*"  
*Coscinodiscus subtilis*  
*Melosira nummuloides*  
*Rhabdonema minutum*  
Great Britain; "Angleterre"  
Van Heurck 520

 *Actinocyclus barkleyi*  
*Campylodiscus echineis*  
Australia (Victoria) Yarra Yarra; "Depôt de Yara-Yara (Australie)"  
Van Heurck 521

 *Actinocyclus ellipticus* Grunow  
*Coscinodiscus lewisianus* Greville  
Spain (Sevilla) Moron; "Moron (Espagne)"  
Van Heurck 522

 *Actinocylcus roperii* (Brébisson) Grunow  
*Amphora arenaria*  
*Coscinodiscus ovalis* Roper  
*Eupodiscus roperi*i Brébisson  
*Hantzschia marina*  
*Navicula aestiva*  
*Navicula granulata*  
*Navicula liber*  
France (Calvados); "Normandie (France)"  
Van Heurck 523

 *Achnanthes lanceolata*  
*Actinocyclus helveticus* Grunow  
*Cymbella affinis* var. *excisa*  
*Encyonema ventricosum*  
*Gomphonema angustatum* var. \[unnamed\]  
*Meridion circulare*  
*Nitzschia fonticola* Grunow f. *parva*  
*Odontidium mesodon*  
Switzerland (Neuchatel) Neuchatel; "Neuchatel (Suisse)"  
Van Heurck 524

 *Pseudotriceratium cinnamomeum* Grunow \[as "*Pseudo-Triceratium*"\]  
Spain (Sevilla) Moron; "Moron (Espagne)"  
Van Heurck 525

 *Eunotogramma frauenfeldii* Grunow  
Australia; "Australie"  
Van Heurck 526

 *Asteromphalus ralfsianus* Grunow  
Chile (Tarapaca); "Guano de Pèrou"  
Van Heurck 527

 *Coscinodiscus crassus* var. *morsiana* Grunow  
*Coscinodiscus oculus-iridis* Ehrenberg  
*Coscinodiscus symbolophorus*  
*Trinacria regina* Heiberg  
Denmark; "Jutland"  
Van Heurck 528

 *Coscinodiscus excentricus*  
*Coscinodiscus radiatus* Ehrenberg  
*Ditylum brightwellii*  
*Hyalodiscus stelligera* J.W. Bailey  
*Pleurosigma normanni*  
*Podosira maculata* W. Smith  
England (Humberside) Kingston-upon-Hull; "Estomac d'Ascidies à Hull (Angleterre)"  
Van Heurck 529

 *Coscinodiscus excentricus* Ehrenberg  
Baltic Sea; "Mer Baltique"  
Van Heurck 530

 *Coscinodiscus centralis* Ehrenberg f. *minor*  
Baltic Sea  
Van Heurck 531

 *Coscinodiscus rothii* Grunow f. *minor*  
Germany (Schleswig-Holstein) Wedel; "Wedel (Holstein)"  
Van Heurck 532

 *Coscinodiscus fasciculatus* A. Schmidt  
*Coscinodiscus normanni* Gregory  
*Coscinodiscus rothii* Grunow  
Belgium (Antwerpen) Antwerp; "Anvers (Belgique)"   
Van Heurck 533

 *Actinoptychus undulatus*  
*Coscinodiscus argus*  
*Coscinodiscus curvulatus* Grunow var. \[unnamed\]  
*Coscinodiscus fimbriatus*  
*Coscinodiscus marginatus*  
*Coscinodiscus radiatus*  
Algeria (Oran); "Oran (Algérie)"  
Van Heurck 534

 *Coscinodiscus lacustris* Grunow  
*Cyclotella punctata* W. Smith  
*Synedra pulchella*  
England (Yorkshire); Yorkshire (Angleterre)"  
Van Heurck 535

 "Ces récoltes renferment la plupart des formes marines du Synopsis."  
Belgium (West-Vlaanderen) Blankenberge; "Bassin à Blankenberghe\[!\] (Belgique)"  
Van Heurck 536, 537, 538

 "Formes signalées dans l'Atlas du Synopsis"  
United States (Virginia) Richmond; "Richmond (Amérqiue)"  
Van Heurck 539, 540, 541

 *Actinocyclus barklyi*  
*Campylodiscus bicostatus* \[cf.\]  
*Campylodiscus clypeus* var. \[unnamed\]  
*Campylodiscus daemelianu*s Grunow  
*Campylodiscus echineis*  
*Hyalodiscus subtilis* var. \[unnamed\]  
*Navicula lauta* Grunow  
*Navicula smithii*  
*Navicula yarrensis* Grunow  
*Nitzschia acuminata* var. *novae-hollandiae*  
*Nitzschia tryblionella* var. *maxima* Grunow  
Australia (Victoria) Yarra Yarra; "Yarra-Yarra (Australie). Dépôt fossile"  
Van Heurck 542

 *Actinoptychus marylandicus*  
*Actinoptychus undulatus*  
*Actinoptychus vulgaris*  
*Craspedodiscus microdiscus*  
*Stephanopyxis corona*  
*Stephanopyxis diadema*  
*Triceratium reticulus*  
United States (Virginia) Rappahannock River; "Rappahanneck\[!\] (Virginie). Dépôt fossile"  
Van Heurck 543

 *Achnanthidium flexellum*  
*Actinella punctata* Lewis  
*Encyonema gracile*  
*Encyonema turgidum* var. \[unnamed\]  
*Eunotia bacteriana*  
*Eunotia faba* Ehrenberg  
*Eunotia gibbosa* Grunow  
*Eunotia gracilis*  
*Eunotia incisa*  
*Eunotia major*  
*Eunotia pectinalis* var. \[unnamed\]  
*Eunotia robusta*  
*Fragilaria virescens* \[as "*Fragillaria*"\]  
*Gomphonema acuminatum* var. *coronata*  
*Gomphonema gracile* Ehrenberg var. \[unnamed\]  
*Navicula amphigomphus* Ehrenberg  
*Navicula dactylus*  
*Navicula divergens* var. \[unnamed\]  
*Navicula gibba*  
*Navicula iridis* var. *amphigomphus*  
*Navicula major*  
*Navicula nobilis*  
*Navicula nodulosa* var. \[unnamed\]  
*Navicula pollis*  
*Navicula rhomboides*  
*Navicula serians*  var. \[unnamed\]  
*Navicula tumescens* Grunow  
*Navicula viridis*  
*Pseudoeunotia hemicyclus* (Ehrenberg) Grunow \[as "*Pseudo-Eunotia*"\]  
*Stauroneis anceps*  
*Stauroneis phoenicenteron*  
*Stauroneis scaphuliformis* var. \[unnamed\]  
*Stauroneis stodderii*  
*Stenopterobia anceps* (Lewis) Brébisson  
*Stenopterobia intermedia*  
*Surirella biseriata*  
*Surirella constricta*  
*Tabellaria fenestrata*  
*Tabellaria flocculosa*  
United States (New Hampshire) Bemis Lake; "Benis\[!\] Lake (Etats-Unis). Dépôt fossile"  
Van Heurck 544

 *Achnanthes baldjikiana* Grunow  
*Achnanthes danica* (Flogel)\[Grunow\]  
*Campylodiscus thuretii* var. *baldjikiana* Grunow  
*Cestodiscus stokesianus* Greville  
*Cocconeis danica* Flogel  
*Cocconeis lorenziana* Grunow  
*Epithemia gibberula* var. *protracta* Grunow  
*Grammatophora insignis* Grunow  
*Grammatophora marina* var. *baldjickiana* Grunow  
*Grammatophora robusta* Dippel var. *minor*  
*Mastogloia braunii* var. *baldjikiana* Grunow  
*Navicula didyma*  
*Navicula* didyma var. *bleischii* Rabenhorst & Janisch  
*Navicula digrediens* A. Schmidt  
*Navicula lyra* var. \[unnamed\]  
*Navicula moesta* A. Schmidt  
*Navicula palpebralis* var. \[unnamed\]  
*Navicula rejuncta* var. *baldjikiana* A. Scmidt  
*Navicula smithii* var. \[unnamned\]  
*Navicula subcincta* A. Schmidt  
*Odontidium brightwellii*  
*Podosira baldjikiana* Grunow  
Bulgaria (Stalin) Baltchik; "Baldjick. Dépôt fossil. Grandes formes"  
Van Heurck 545

 *Amphora crassa* var. \[unnamed\]  
*Amphora cymbifera* Gregory var. *gigantea* Grunow  
*Amphora cymbifera* Gregory var. \[unnamed\]  
*Amphora intersecta* A. Schmidt  
*Amphora proteus* var. \[unnamed\]  
*Amphora sarniensis* Greville var. \[unnamed\]  
*Amphora weissflogii* A. Schmidt  
*Campylodiscus limbatus* var. *australi*  
*Campylodiscus striolatus* Grunow  
*Cocconeis baldjikiana* Grunow  
*Mastogloia elegans* Lewis var. \[unnamed\]  
*Navicula lineata* Donkin var. \[unnamed\]  
*Surirella baldjikii* Grunow  
Bulgaria (Stalin) Baltchik; "Baldjick, Dépôt fossile. Formes légères"  
Van Heurck 546

 *Eunotia formica*  
*Eunotia gracilis*  
*Eunotia monodon*  
*Eunotia pectinalis* var. *undulata*  
*Gomphonema gracile*  
*Navicula dactylus*  
*Navicula major*  
*Navicula viridis*  
*Stauroneis phoenicenteron*  
United States (Connecticut) Willington; "Wellington\[!\] (Connecticut). Dépôt fossile. Grandes formes"  
Van Heurck 547

 *Eunotia formica*  
*Eunotia gracilis*  
*Eunotia incisa*  
*Eunotia monodon*   
*Eunotia pectinalis* var. *undulata*  
*Eunotia praerupta* var. *bidens*  
*Eunotia undulata*  
*Gomphonema gracile*  
*Melosira crenulata* var. *tenuis*  
*Navicula bacillum*  
*Navicula viridis*  
*Stauroneis phoenicenteron* \[as "*phoenicenterum*"\]  
United States (Connecticut) Willington; "Wellington\[!\] (Connecticut). Dépôt fossile. Petites formes"  
Van Heurck 548

 *Amphiprora decussata*  
*Amphiprora didyma*  
*Amphiprora pusilla*  
*Amphora littoralis* Donkin  
*Coscinodiscus excentricus*  
*Donkinia recta*  
*Navicula aestiva*  
*Navicula arenaria*  
*Navicula avenacea* f. *minor*  
*Navicula blanda* A. Schmidt f. *curta*  
*Navicula cruciformis*  
*Navicula cyprinus*  
*Navicula didyma*  
*Navicula entomoides* f. *minor*  
*Navicula forcipata*  
*Navicula granulata*  
*Navicula hyalina*  
*Navicula lyra*  
*Navicula palpebralis*   
*Navicula peregrina*  
*Navicula suborbicularis*  
*Nitzschia spathulata*  
*Pleurosigma lanceolatum*  
*Surirella smithii* var. *pulchella* Grunow  
Scotland (Strathclyde) The Cumbraes; "Cumbrae (Angleterre. Marin. Formes diverses"\]  
Van Heurck 549, 550