— 18 — 



Epithemia argus Eh. 



Epthemia zébra Eh. 



Fragilaria mutabilis Grun. 



Fragilaria virescens Ralfa. 



Gomphon&ma acuminatum Eh. 



Gomphonerna abbr&oiatwm Ag. 



Gomphonema intricatum Ktz. 



Gomphonerna olivaceum Eh. 



Gomphonema parvulum Ktz. 



Hantz,schia amphioxys Griin. 



Navicula Brebissonii Ivtz. 



Navicula cincta Eh. 



Navicula cincta var. Heufleri Grun. 



Navicula cryptocephala Ktz. 



Navicula mutica Ktz. 



Navicula pumila Grun. 



Navicula Reinhardtii Grun. 



Navicula sphaerophora Ktz. 



Navicula viridis Ktz. 



Nitzschia Heufleriana Grun. 



Nitzschia linearis "W. Sm. 



Nitzschia palea W. Sm. 



Nitzschia recta Hantz. 



Nitzschia stagnarum Rab. 



Nitzschia thermalis Grun. • 



Rhoicosphenia curvata Grun. 



Rhopalodia gibba 0. Miill. 



Rhopalodia gibberula 0. Miill. 



Stauroneis dilatata^W. Sm. 



Surir ella ovalis Breb. 



Surir ella ovata Ktz. 



Surir ella patella Eh. 



FanTiewcfoa vulgaris V. Heurck. 



Vrfewcfcm im^am var. Zacustris M. .Fer. 



