A. CLEVE-EULER, DI AT. FLORA OF FINLAND. 41 



of 10 striae in 10 {i, frequently missing unilaterally on a space 

 near the centrum and irregularly dilated on the opposite side. 

 Axial striae smooth or interrupted in the middle. Marginal 

 striae 8 in 10 [j., composed of circular puncta. Hypotheca 

 with 10 — 11 finely punctate striae, vanishing towards the 

 centrum. 



Foss.: Kk. Knjäsha (mar.). 



ÖSTRUP has in D. N.-E. Greenl., p. 214, Tab. 13, f. 17 

 mentioned and figured the hypotheca of a Cocconeis, that 

 may possibly be this species. 



Cocconeis pseudo-marginata Greg. D. of Clyde, Tab. 9, 

 f. 27, 28. V. H. Syn. Tab. 29, f. 20, 21. 



Foss.: Kk. Knjäsha. 



Distr. (mar.): West and East Arctic Sea, Mediterranean, 

 Red Sea, Indian Ocean, Pacific Ocean. (Foss.) Hungary. 



Cocconeis Entomon n. sp. — PI. 2, f. 52. 



Frustule elliptical, with rounded ends. Epitheca 80 ^ 

 in length, 37 [t in breadth, with a broad, linear axial area 

 and 3 radiate costae in 10 [j., separated by double, occas- 

 sionally single or triple rows of coarse puncta, 5 — 6 in 10 u. 

 in the row. Lower valve not seen. 



Foss.: Kk. Knjäsha, rare (mar.). 



Of this interesting species, I unfortunately have seen a 

 single epitheca only, so badl}'^ placed that I could draw only 

 part of it. Nevertheless it shows such characteristic features, 

 that I have distinguished the species by now, though the 

 diagnosis will have to be completed later on. 



Disconeis Cl. 



Cocconeis pinnata Greg. — V. H. Syn. Tab. 30, f. 6, 7. 

 Foss.: Kk. Knjäsha. 



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

 Sea, Indian Ocean. 



Pleuroneis Cl. 



Cocconeis costata Greg. var. typica Cl.? Syn. Nav. D. 

 II, p. 182. — V. H. Syn. Tab. 30, f. 11, 12. 



Length of the valve about 18 [J-, breadth about 10 a. 

 Costae 8 in 10 {1 at the margin. 



