A. CLEVE-EULER, DIAT. FLORA OF FINLAND. 69 



this disc is not quite clear. It may possibly be a form of 

 Coscinodiscus excentrimis. 



Coscinodiscus excentricus Ehb. — V. H. Syn. Tab. 130, 

 f. 4. Nord. Plankton, p. 29, f. 29. 

 Foss.: Kk. Knjäsha. 

 Distr. (mar.): Arctic Sea, Atlantic. 



Coscinodiscus hyalinus Grun. Franz Jos. L. D., p. 56, 

 Tab. 3, f. 28. 



Foss.: Kk. Knjäsha. 



Distr. {mar.): East Arctic Sea. 



Diameter of Finlandian specimens 50 jj-. Inframarginal 

 spines more distant than on Grunow's figure, that has been 

 drawn from a smaller specimen. 



Coscinodiscus subtilis Ehb. var. glacialis Grun. f. major 

 nob. 



Foss.: Kk. Knjäsha. 



Distr. (war.): East Arctic Sea. 



To this variety I refer, because of the similar structure, 

 some specimens with exceedingly delicate rows of alveoli, 

 arranged in about 15 fascicles. Diameter 40 — 45 [J.. The 

 Cose, subtilis var.? glacialis of Grunow is recorded to have 

 only 8 fascicles and to be only 22 p. in diameter. 



Coscinodiscus curvatulus Grun. — A. S. Atl. Tab. 57, 

 f. 33. — Syn. Coscinodiscus curvatulus var. inermis Grun. 

 Franz Jos. L. D., p. 31, Tab. 4 (D.), f. 11, 12. — Nord. 

 Plankton, p. 35, f. 37. 



Foss.: Kk. Knjäsha, Koudajärvenpää, rather frequent. 



Distr. {mar.): Arctic Sea, North Atlantic Ocean, Foss.: 

 Peru-Guano; Richmond. 



Coscinodiscus curvatulus Grun. var. minor Grun. 

 Foss.: Ka. Viborg-deposit (Cleve 1894). 



Coscinodiscus curvatulus Grun. var. kariana Grun. A. 

 D. Tab. 7, f. 129. 



Foss.: Kk. Knjäsha, rare. 

 Distr. {mar.): East Arctic Sea. 



Coscinodiscus subbuUiens Jörg. — Nord. Plankton, p. 

 32, f. 32. 8ijn.? Coscijiodiscus devius A. S. Atl. Tab. 60, f. 1—4. 



