A. CLEVE-EULER, DIAT. FLORA OF FINLAND. 53 



Lineares Grun. 

 Nitzschia vitrea Norm. — V. H. Syn. Tab. 67, f. 10, 11. 

 Foss.: Sat. Panelia (dep. from the Litorina-e^och) . 

 Distr. {brack, iv.): Baltic, North Sea, Adriatic (Gruxow), 

 Africa, Asia, Arctis. 



Nitzschia vitrea Norm. var. salinarum Grun. — A. D., 

 p. 94. V. H. Syn. Tab. 67, f. 12. 



Foss.: Ab. Hindersmossen; Sat. Panelia. 

 Distr. {brack, lo.): North Sea; Africa. 



Nitzschia polaris Grun. — Franz Jos. L. D., p. 54, Tab. 

 1 (A), f. 62—63. 



Foss.: Kk. Knjäsha, not rare, usually many together. 



Distr. (??iar.): Greenland (östrup), Franz Josefs Land. 



The specimens observed belong to the shorter form 

 (Grunow's fig. 63). 



Rhopalodia 0. MCll. 



Rhopalodia parallela (Grun.) 0. M. — Syn. Epiihemia 

 gibba (Ehb.) Kütz. var. imralhla Grun. V. H. Syn. Tab. 

 32, f. 3. 



Foss.: Ka. Viborg-deposifc (Cleve 1894). Nyl. Kyrkslätt, 

 Distr. {fresh iv.): Ubiquist. Common in Baltic deposits 

 from the Ancylus-epoch. 



Epithemia Bréb. 



Epithemia Hyndmannii W. Sm. — V. H. Syn. Tab. 31, 

 f. 3. — Icon. nost. PI. 3, f. 63. 



Ladoga. Foss.: Ka. Viborg-dep. (Cleve). Ab. Hinders- 

 mossen. Nyl. Kyrkslätt. Sat. Panelia. 



Distr. {fresh iv.): (foss.) Frequent in deposits from the 

 AncylusSesi. Europe, Asia. 



It has been suggested by Grunow (cfr. östrup, Danske 

 Diät., p. 168), that this species should be nothing but the 

 sporangial form of Epiihemia turgida. Notwithstanding the 

 unprobability of a sporangial form occurring in great masses, 

 almost free from the supposed typical species, as is sometimes 



