40 ARKIV FÖR BOTANIK. BAND 11. NIO 9. 



Cocconeis sp. — PL 4, f. 88. 



This small form somewhat recalls Cocconeis Disculus, as 

 it has been drawn by 0strup, but can hardly be a form of 

 that species, the puncta being very irregular. 



Foss. : Sat. Panelia, rare. 



Eucocconeis Cl. 



Cocconeis molesta Kütz. var. Lindbergii n. var. — PL 

 4, f. 86 a, b. 



Frustule elliptical, 20 — 22 [j. in length, 9 — 11 [x in breadth. 

 Areas undistinct. Epitheca with 20 slightly radiate striae in 

 10 jj., composed of elongated puncta, the valve thus appearing 

 longitudinally lineated. Hypotheca with 23 finely punctate, 

 radiate striae in 10 [i. No marginal line. 



Foss.: Kk. Knjäsha {mar. dep.). 



Differs from the type by the less close striae. 



Cocconeis dirupta Greg. — V. H. Syn. Tab. 22 f. 13—15. 



Foss.: Nyl. Kyrkslätt. 



Distr. {mar,) Arctic a. Antarctic Seas; ubiquist. 



Cocconeis Oestrupii nob. — Syn. Cocconeis sp. 0str. D. 

 N.-E. GreenL, p. 214, Tab. 13, f. 17. — ? Icon. nost. PL 4, f. 87. 



Frustule elliptical, 30 — 35 \>. in length, 17 — 21 \). in breadth. 

 Epitheca with a narrow linear area and slightly radiate, deli- 

 cate striae, 11 in 10 [x. Hypotheca with 11 radiate, finely 

 punctate striae in 10 [x, vanishing towards the centrum. A 

 marginal ring with 6 alveoli in 10 [J. ?. 



Foss.: Kk. Knjäsha {mar.). 



Distr. {mar.): East Greenland. 



The lower valve, described above, exactly resembles 

 0STRUp's Greenlandian form, of which he has not seen the 

 epitheca. The isolated epithecae, to which the diagnosis refers, 

 can hardly belong to anything but this species, that I have 

 named in honour of Mr 0strup. On single valves, I have 

 no more than Mr 0strup seen any ring. If the frustule, 

 drawn in fig. 87, thus belongs to this species cannot be stated 

 with certainty. 



Cocconeis pulchella n. sp. — PL 2, f. 51 a, b. 



Valves elliptical, 32 u. in length, 20 a in breadth. Epi- 

 theca with a linear, axial area and large lateral, semi-elliptical 

 areas. On each side of the axial area a narrow, linear band 



