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During tlie expedition of the Vega Mr. Kjellman collected a
number of samples containing diatoms, which with the
permission of Prof. Nordenskiöld were delivered to me for
examination.
The gatherings were the following:
1. Five bottles with diatoms collected on the ice near
Cape Wankarema.
2. Diatoms washed from algae, collected near Pitlekaj,
Cape Deschnew (East Cape).
3. Surface diatoms from the Behring Sea.
4. Fresh-water diatoms from Japan.
5. Diatoms from algce collected 011 the Island of Labuan
near Borneo.
6. Diatoms washed from alga3 collected near Point de
Galle, Ceylon, and coarse bottom-mud, dredged in the same
locality.
7. Mud from the bottom between Åden and Bab-el-Mandeb.
Besides tliere were taken several samples of mud from
the bottom of the North Siberian sea, which all proved free
from diatoms.
For the examination of several ofthese samples, sufficiently
clean slides could not be prepared by the usual cleaning
process, so that the specimens must be selected and mounted.
In this difficult work I had the good fortune to be helped by
the german microscopist Mr. Weissflog, who prepared for
me, with the most exquisite skill, slides containing diatoms
from Labuan, Ceylon and Bab-el-Mandeb. For this
consider-able assistance, without which I should hardlv have found
so many species, I render him my best thanks.
I. Diatoms of the Arctic Sea.
The first notices about the diatoms of the Arctic Sea
have been given in 1841 by Ehrenberg, who examined some
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