CoMCinodiscus Ocaiai iridis Eh. 



— odontodiscus Grun. 



— omphalanthus Eh, 



— perforatus Eh. 



— punctatus Eh. 



— radiatus Eh. 



— radiolatus Eh. 



— robustus Grev. 



— subtilis var. 



r— symbolophorus Eh. 



— turgidus Ratt. 



— celatus Eh. 



— oetustissimus Pant. 



— Woodwardii Eul. 



Craspedodiscos coscinodiscUs Eh. 

 Eacampia virginica Grun. 

 Goniotbecium odontella Eh. 

 Hyalodiscns subtilis Bail. 

 Mastogonia actinoptychus Eh. 

 Melosira snleata Ktz. 



— — V. minor Ktz. 



— — V. separanda A. S. 



— — fa radiataGrun. 



— 99 - 



Navicula con/œderata Pant. 



— distans W. Sm. 



— prisca A. S. 

 Pleurosigma afflne v. fossilis Grun. 

 Pyxilla atnericana Eh. 



— dubia Grun. 

 Stepbanogonia polygona Eh. 

 Stephanopyxis corona Grev. 



— limbata Eh. 



— turris Grev. 

 SUctodiscus Kittonianus Grev. 

 Surirella alternans A. S. 

 Triceratinm acutum Eh. 



irregulare v. hebetata Grun 



— membranaceum Bright. 



— obtusum Eh. 



— rtiticulatum Eh. 



— sculptum V. petropolitana 

 Grun. 



— tridactylum Bright. 



Zygoceros circinnus Ralfs. 



No 184 VILLERS-SUR-MER (Calvados) France 



Sur le sable 



Chsetoceros armatuin West. 



No 185 SAINT-LUNAIRE (Ille- et -Vilaine) France 



Sur les algues 



Isthmia enervis Ktz. 



N" 186 



ABERDËEN (Ecosse) 



Gomphonema geminatum Ag. 



