125 Canadian Arctic Expedition, 1913-18 
It has been found only in Scandinavia, in bodies of water in the north of 
Sweden, and in lakes north of Kristiania, in Norway. Lilljeborg states that it 
is mostly found in small bodies of water, and is rare. In the collections of the 
Canadian Arctic Expedition it occurred in only one locality, a lake at Konganevik 
(Camden bay), Arctic Alaska, in a gathering made June 26, 1914. Only a few 
individuals were found. 
The correspondence with the descriptions of Sars and Lilljeborg was very 
close. The antenne, shown in PI. IV, fig. 9, are composed of twelve segments, 
and about equal in length the first cephalothoracic segment. In the abdomen, 
shown in PI. IV, fig. 4, the second, third, and fourth segments nearly equal each 
other in length, and together are somewhat shorter than the first segment. The 
branches of the furca, Pl. IV, fig. 10, are five times as long as broad and the lateral 
seta is placed just distad of the middle. The last abdominal segment is armed 
on its posterior border with fine spines. The formula for the spines of the 
terminal segments of the exopodites of the swimming feet is 3, 4, 4,4, The 
fifth foot, Pl. IV, fig. 8, resembles that of the viridis group, but the second segment 
is shorter and cylindrical; its length and width are about the same. The form 
of the receptaculum seminis is shown in PI. IV, fig. 11. 
The length of the females measured varied from 1.55 mm. to 2.55 mm. 
In the original description in 1863 Sars states the length as about 2 mm., and 
Lilljeborg, in 1901, says the length of the females is from 1.8 to 2.1 mm. 
This species is readily distinguished by its short 12-segmented antennae, 
its elongated furca with the lateral seta about midway of its length, the fifth 
foot, and the receptaculum seminis. 
The finding of this species is of a good deal of interest, for it has hitherto 
been known only from Scandinavia, and there was a rare form. It may be 
expected that future collections will show that it occurs in the lands inter- 
re between the Scandinavian peninsula and the Arctic shore of North 
merica. 
DISCUSSION OF THE COPEPOD COLLECTIONS WITH REFERENCE TO DISTRI- 
BUTION. 
Of the species of these collections, C. americanus is very widely distributed, 
and its occurrence in the Arctic has no significance. C. magnus is probably a 
cold-water form. 
The genus Eurytemora is widely distributed in brackish water. It is 
interesting that it was found in a new species. 
The only account published previously of the presence of the genus Hetero- 
cope in America, was by Juday and Muttkowski in their description of H. 
septentrionalis, and it would appear that it may be rather widely distributed 
across the American continent. In Europe, and Asia the genus is found most 
commonly towards the north and in larger bodies of water, but it extends to 
central Europe. 
Limnocalanus macrurus is the only species of this genus which has hitherto 
been found on the American continent. Brehm, 1911, also reports L. macrurus 
in Greenland. It will be interesting from future collections to find out how 
widely L. johanseni is distributed. 
Diaptomus bacillifer is new to America, and, as already stated, while dis- 
tinetly a cold-water form, is probably the most widely distributed species of 
the genus. 
Diaptomus arcticus is a new form very closely related to D. shoshone and 
D. wardi, and it will be interesting to know the geographical limits of the three 
species. 
The occurrence of Cyclops strenuws on the borders of the Arctic ocean, with 
the former records of its presence in lakes in New York, makes it probable that 
it may be found anywhere in North America north of the latitude of New York. 
