4 oP. T. CLEVE, DIATOMS FROM BAFFINS BAY AND DAVIS STRATIT. 
Lat. North and 70” Long West, on the 8:th and 14:th of July 
contained chiefiy crustaceans. 
A collection taken the 24:th of July east of Carey Island 
by another Swedish naturalist M. A. ÖHLIN consisted, on the 
contrary, almost exclusively of diatoms, Thalassiosira Norden- 
skiöldit being predominant. 
From the 15:th of August to the 24:th of September five 
samples were collected off Bylot Island, all of a perfectly 
different character. The cilioflagellates were reduced to a mi- 
nimum, and the diatoms predominant, but very different from 
those of the May-plankton. They consisted chiefly of Cheeto- 
ceros, OC. groenlandicus beimg by far the most predominant. 
On the 2:d and 6:th of October two gatherings were 
collected east and north-east of Cumberland Strait, both very 
rich in diatoms, but of another character than the samples 
previously taken. They contained abundantly such forms as 
Thalassiosira Nordenskiöldit, which characterizes the Polar 
Sea, from Jalmal and Spitsbergen to the east coast and south- 
end of Greenland, and others, which occur in abundance in 
the northern Atlantic, especially south of Iceland, such as 
Chetoceros atlanticus and Thalassiotrix longissima. It is thus 
evident, that the plankton was mixed, derived partly from 
the polar stream and partly from the Atlantic. 
Samples collected from the 7:th to the 10:th of October 
in Davis Strait consisted mainly of fragments of Ceratium 
Tripos, evidently killed either by the low temperature, or 
by the influence of water containing a different amount of 
salt. The scarcer diatoms in these samples were of the same 
character as in the gatherings of the 2:d and 6:th of October. 
Among the pelagic diatoms were found in most samples ra- 
rely some litoral forms, but of a particular interest. To 
obtain a larger supply of these forms I treated a quantity 
of the Ceratium-plankton, collected the 1:th of August about 
30 nautical miles east of Cape Eglinton, with acids and by 
that mean obtained material for two or three slides, in which 
I found a considerable number of species, most of them known 
from the collection made by Professor KJELLMAN on the ice 
at Cape Wankarema, near Behrings Strait, or from GRUNOW'S 
examination of a sample taken on a ice-flake between Novaja 
Semlja and Franz Josefs Land as well as from Oestrup's 
researches in the diatoms found on the ice-flakes, which drift 
