10 P. T. CLEVE, DIATOMS FROM BAFFINS BAY AND DAVIS STRATT. 
Coscinodiscus bioculatus GRUS. (Franz Jos. DL. D. P1. ITT 
f£.. 30, Pl. IV f. 1, 2) occurs, rarely, in May but is not rare 
in the October-plankton from Davis Strait. Entire frustules 
are cylindrical, with long, transversely pliecate, very thin 
connecting zone, and the species might so be considered as a 
Lauderia. Cosc. bioc. occurs in the Cape Wankarema mate- . 
rial and was found on a iceflake, met with between Franz 
Josefs Land and Novaja Semlja, but nowhere else, so far as 
Fanömnas — 125 JÖRN 
Coscinodiscus excentricus EHB. This widely distributed spe- 
cies was found abundantly in Davis Strait in October. 
Whether it be an inhabitant of the polar sea properly, or 
not, requires further researches, as OC. excentricus probably 
comprises different forms. 
Coscinodiseus hyalinus GRUN. is a true polar form. It was 
found in abundance in May at Disco. 
Coscinodiscus lacustris var. hyperboreus GRUN. was found 
sparingly in the plankton, collected the 15:th of August. It 
is probably derived from molten ice. 
Coscinodisceus Oculus TIridis EHB., which I do not consider 
as specifically different from C. asteromphalus, occurred in 
immense masses in the month of May, later on in the year 
it became scarce. The form from Baffins Bay has very finely 
punctate alveoli, thus agreeing with OC. asteromphalus found 
in the North Sea and in a fossil state in the Baltic deposits 
of the Litorina-epoch. It is to be considered as a cosmopo- 
litan species, euryhaline to such a degree that it can endure 
water with about 0,9 percent of salt. 
Coscinodiscus subglobosus OL. & GRUN. represents the endo- 
cysts of a diatom, named below as Thalassiosira gravida. 
Eucampia groenlandiea CL. N. Sp. Chains arcuate, with 
rounded quadrate foramina, many times shorter than the 
cellules. Cellules in sagittal view nearly rectangular, with 
short, truncate angular processes, in transversal view narrow, 
with parallel margins and rounded rostrate ends. Dimen- 
sions: long. ax. 0,032 to 0,1; sag. ax. 0,013 to 0,02; transv. ax. 
0,01 mm. Zone with scarcely visible divisions. Valves with 
distinct central nodule and indistinct structure. — P1. IT, 10. 
This species occurs sparingly in the plankton of Baffins 
Bay from the middle of August and in Davis Strait in the 
beginning of October. 
