18 ARKIV FÖR BOTANIK. BAND 14. N:0 9. 



Distr. {mar. and brack.): Franz-Josefs Land, North Sea, 

 Indian and Pacific Oceans, Antarctis. 



The outline varies between elliptic-lanceolate and broadly- 

 linear. 



Cymbella Ag. 



Cymbella hyalina n. sp. — PL 4, f. 77. 



Valve asymmetrical, lanceolate with protracted-subcapi- 

 tate ends. Ventral margin slightly indented in the middle. 

 Length 17 [j-, breadth 4 jj.. No striation visible. 



Foss.: Ab. Hindersmossen, rare {fresh iv.). 



Comes near to the more symmetrica] little Cymhella mi- 

 nuscula Grun. A. S. Atl. Tab. 9. f. 58 — 61, that Cleve has 

 united with the following. 



Cymbella microcephala Grun. — V. H. Syn. Tab. 8, 

 f. 36—39. 



Foss.: Ab. Hindersmossen. 



Distr. {fresh w.) Greenland. Sweden, Danmark, Scotland, 

 Belgium, S. America. 



Cymbella lata Grun. Syn. Nav. D. I, p. 165, Tab. 4, 

 f. 27. — Syn. Cymhella Ehrenhergii var. A. S. Atl. Tab. 71, 

 f. 74. 



Foss.: Nyl. Kyrkslätt, Hindersmossen. 



Distr. {fresh or slightly brack, w.): Sweden, Danmark, 

 Ladoga, N. Germany; Antarctis. 



Cymbella Ehrenbergii Kütz. var. delecta A. S. — Syn. 

 Cymbella Ehrenbergii var. minor V. H. Syn. Tab. 2, f. 2. 



Foss.: Pahanajoki (Cleve); Ab. Hindersmossen. 



Distr. {fresh lu.): Greenland etc., ubiquist. 



Probably identical with the »/. minor» quoted in Cleve's 

 D. of Finl., p. 45. 



Cymbella (Encyonema) lacustris (Ag.). — Syn. Schizonema 

 lacnstre Ag. V. H. Syn. Tab. 15, f. 40. Colletonema subcohe- j 

 rens Thwaites in W. Sm. B. D. II, Tab. 56, f. 353. ^ 



Foss.: Ab. Hindersmossen. 



