
Euphyllopod Crustacea of the American Arctic. 
By Frits JOHANSEN. 
With many text-figures. 
INTRODUCTION. 
The areas examined for freshwater crustacea during the Canadian Arctic 
Expedition in the years 1913-16, were the south side of Seward peninsula, 
Alaska (Nome and Teller); the north coast of Alaska and Yukon Territory from 
Camden bay to Herschel island; Cape Bathurst; and the south side of Dolphin 
and Union strait, from Young point to Cape Krusenstern. At Cape Bathurst 
of the Entomostraca only Copepods, Cladocera and Ostracods were found. 
Besides these Canadian Arctic Expedition specimens I have been able to 
examine many of the Euphyllopods formerly collected in the American Arctic 
(Point Barrow and Pribilof islands, Alaska; Fullerton, west side of Hudson 
bay; Labrador, Ungava, Ellesmere island), and to compare them with specimens 
from Greenland. Among the records of these older collections (some of which 
are here recorded for the first time), I include the additional data given by 
Baird, Packard, Sars, Daday de Dées, etc. 
The present report thus aims to be a fairly complete account of the Euphyl- 
lopod Crustacea now known from the American Arctic (excluding Greenland). 
They comprise one! species of Notostraca, three of Anostraca, one of which is 
described as new; and one species of Conchostraca. 
For a description of the various lagoons, lakes, and ponds, etc., examined 
during the Canadian Arctic Expedition I refer to Part N, in this volume. 
I am indebted to the officials of the United States National Museum, 
-Washington, D.C., for an examination of the arctic Euphyllopoda deposited 
there; to Prof. G. O. Sars of Christiana, Norway, for certain information about. 
the specimens recorded by him; to Prof. A. S. Pearse of the University of Wis- 
consin, Madison, for assistance of various kinds, and to Dr. A. G. Huntsman of 
Toronto University, for many helpful suggestions on the manuscript of this 
report. 

1Professor G. O. Sars advises me to omit from this report reference to specimens of Lepidurus 
apus (L.) secured by the Second Norwegian Arctic Exped. on Grinnell Island and recorded by him (1911). 
(See Canadian Field-Naturalist, Vol. 35, p. 47.) 
2Tn the fall of 1921 the author had the opportunity to examine arctic Euphyllopoda in tie collections 
in Scandinavia. The data secured of importance to this report have been inserted during the printing 
of it. Similar specimens in British Museum of Natural History, London, were also examined. 
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