A. CLEVE-EÜLER, DIÄT, FLORA OF FINLAND. 23 



N. directa var. genuina Cleve, Syn. Nav. D. II, p. 27. 

 — Navicula directa W. Sm. B. D. I, Tab. 18, f. 172. 



Foss.: Kk. Knjäsha. 



Distr. {mar.)\ East and West Arctic Sea, North Sea, 

 Yoliohama, Antarctis. 



Navicula directa W. Sm. var. subtilis Greg. D. of Clyde. 

 Tab. 1, f. 19. 



Foss.: Kk. Knjäsha, rare. 



Distr. {mar.): East Arctic Sea, North Sea. 



Navicula directa W. Sm. var. cuneata 0str. Mar. O. 

 0st-Gronl., p. 428. Tab. 4. f. 42. 



Foss.: Kk. Knjäsha. 



Distr. {mar.): East Greenland. 



The specimens I have seen are perfectly similar to östrup's 

 Greenlandian form. Valve 42 — 64 ;j. in length, 7 — 11 [j. in 

 breadth, with 9 — 10,5 striae in 10 [j.. 



Navicula Kariana Grun. var. frigida Grun. Franz-Jos. L. 

 D. Tab. 1, f. 25. 



Foss.: Kk. Knjäsha, rare. 



Distr. {mar.): Greenland (östrup). East Arctic Sea. 



Navicula gelida Grun. Franz-Jos. L. D. Tab. 1, f. 27, 28. 

 Foss.: Kk. Knjäsha, rare. 

 Distr. {mar.): East and West Arctic Sea. 

 Typical specimens, varying in length between 25 and 50 |j., 

 in breadth between 10 and 12 «x. 



Navicula ammophila Grun. var. intermedia Grun. — 

 Cleve, Syn. Nav, D. II, p. 30. Syn. Navicula cancellata f. 

 minuta Grun. A, D. Tab. 2, f. 41. — Icon. nost. PI, 4, f, 82. 



Foss,: Kk. Knjäsha. 



Distr. {mar.) : Greenland (östrup), East Arctic Sea. 

 (Foss,) Hungary, 



Navicula ammophila Grun, var. Oestrupii n, var. — PI, 

 4, f. 8], 



Valve broadly lanceolate with attenuated, acute ends, 



