542 



C. Scutellum Klir. var. californica Grim., A. S. Atl. tab. CXCL, 



rigs. 42— 43. 



Ejde lOslcrii ■; Thorshavn S trom o). 



Occurs frequently in the gathering from the former locality. 



82. C. Scutellum Ehr. vår. Fig. 115. 6(! %. Cfr. C. speciosa Greg., 

 Mier. Journ. III., tab. IV., tig. 8. 



Epitheca L: 0,016" mm., B: 0,018 mm.; Hypotheca L: 

 0,018 mm., B: 0,016 mm. The valve rhombic, sometimes 

 - especially in the epitheca - obliquely developed. 



Epitheca: Striæ numbered along the median line 

 12 — 14 in 0,01 mm., and consisted of coarse, square puncta. 



Hypotheca: Striæ numbered at the margin 10 in 0,01 



mm., and grew indistinct as it extended lo the raphe. 



This small Cocconeis, which is characterized by its de- 

 cidedly rhombic form, is unquestionably identical with Gregorys C. speciosa, 

 of which he (1. c. lins only figured the epitheca. Gregory (1. e. p. 39) 

 writes with reference to this form that it is »nearly allied to C. Scutellum, 

 bul is usually smaller, and hus somewhat of an angular form«, and he 

 continues »I have closely searched several slides af marine origin, full 

 of Cocconeis Scutellum of every degree of development, but I have not 

 found in them one example of C. speciosa. I therefore re- 

 gard it as a distinct species.« In De To ni' s Sylloge. 

 Bacc, I., p. 445, Cocconeis speciosa Greg. is placed under 

 C. Scutellum Ehr. 



Found only in a gathering from Klaksvig (Bord 6), but 



occurred fairly often in the latter. In another gathering from 



Klaksvig (Bordo) I found a single specimen of a Cocconeis 



(epitheca) which I have shown in the accompanying figure. 



660 /i. It is undoubtedly identical with C. grata A. S. enfr. Perag : Diat. mar. 



de France, p. 15, tab. III., fig. 7. 



Eucocconeis CL, CL, Le, p. 173. 



83. Cocconeis molesta (Ktz.) Grim. var. crucifera Grim., A. S. 



Atl. tab. CXCIII., ligs. 48—51. 



Kvannesund (Videro ; Aaerne Bordo); Nolso. 

 Found frequently in the gathering from Nolso. 



84. C. dirupta Grim., V. H. Syn. tab. XXIX., lig. 13. 



Molen (Ostero); Kalbakfjord (Stromo); Trangisvaag (Sydero). 



In a gathering from Kvannesund Videro) I found a variety of the 

 above-mentioned species which approaches very closely to var. antarctica 

 Grim. V. H., 1. c, ligs. 18—19. 



Pleuroneis CL, CL, 1. c. II.. p. 181. 

 85. Cocconeis costata Greg., V. H. Syn. tab. XXX., ligs. 11 -12. 

 Dispersed in many (39) of the gatherings. Bordo; Ostero; Stromo; 



