MEMORANDA. 



105 



Amphora ovalis 

 „ saliaa 

 „ arenaria 

 Araclmodiscus ornatus 

 Aulacodiscus orieutalis 

 Berkeleya fragilis 



„ Dillwynii 

 Biddulphia pulchella 

 Campylodiscus clypeus 

 Cerataulus turgidus 



,, Isevis 



Ceratoneis arcus 

 Clisetoceras arraatum 

 Cocconeis pediculus 

 „ scutellura 

 „ Grevillei 

 Coscinodiscus ompbalanthus 

 *Cyclotella rectangula 

 Cymatopleura apiculata 

 Cymbella gastroides 

 *Deuticula obtiisa 



* „ t.lienualis 

 *Diatoma graiide 



„ liiemale 

 Doukinia carinata 

 *Eiicyonema prostratum 

 Endosigma eximium. 

 Epithemia turgida 

 argus 

 „ sorex 



* „ constricta 

 Eunotia pectinalis 



„ uudulata 

 Fragilaria virescens 

 „ mesolepta 



* „ minima 



* ,, Harrisonii 

 Gomphonema tenellum 



„ acuminatum 



„ geminatum 



Grammatopliora marina 



*MeIosira numrauloides 

 Navicula nobilis 



„ oblonga 



„ lata 

 *„ Brebissonii 



„ cryptocephala 



„ affinis 



,, serians 



„ spliaerophora 



„ cuspidata 

 Nitzschia obtusa 



* „ Palea 

 „ tenuis 



* „ lanceolata 

 „ Ciosterium 



Orthosira Boeseana 



* „ Dickieii 

 „ arenaria 



Pleurosigma strigosum 

 „ balticum 



„ attenuatum 



„ acumiuatum 



Rhabdonema arcuatum 

 Rlioicosphenia curvata 

 Scliizonema Grevillei 

 *Scoliopleura tumida 

 Stauroneis Phoenicenteron 

 Striatella unipunctata 

 Sui'irella biseriata 

 „ gemma 

 ,, ovata 

 *Syuedra pulchella 



* „ Vaucherige 

 „ splendens 



* „ affinis 

 „ fulgens 



Tabellaria flocculosa 

 Terpsinoe musica 

 *Tetracylus lacustris 

 Triceratium arclicum 



Test-Diatoms — When one speaks of " test/^ how is it 

 possible that Navicula affinis and N. rhomboides can be con- 

 founded ? These diatoms do not resemble each other in any 

 way, either in form or in the fineness of their striae. 

 Navicula affinis is always distinguished by the line or nervure 

 which runs along the margins of the valve, which is gently 

 contracted towards its extremities, and the ends of which are 

 rounded off. The stripe, though difficult to resolve, are much 

 less closely packed (46'60 in "OOl") than those of N. rhom- 

 boides. Different authors, however, have described and drawn 



VOL. VIII. NEW SER. H 



