Band I. Tafel XX. 



178. Truania archangelskiana nov. gen. et spec. Archangelsk ^"/i 



179. Bhaphonels gemmifera Ehrbg. var. elegans 



Grün. Pant. 8zmt-Peter ^k 



180. Stephanopyxis (polaris Grün, var.?) grosse- 



cellnlata nov. spec. Szent-Peter ^"/i 



181. Navicula gemmata Grev. var. fossilis nov. var. Felsö-Esztergäly 



182. Lepidodiscas elegans 0. Witt Archangelsk ^A 



183. Epithemia Mharensis nov. spec. Elesd ^^A 



184. Coscinodiscns radiatns Ehrbg. forma: heterosticta 



Grün. Kekkö ^U 



185. Snrirella (striatula var.?) antiqna nov. spec. Elesd ^"/i 



186. Coscmodiscns yetustissimns nov. spec. Szent-Peter ^k 



