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 Cepepods, 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 Dees, 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.^ 



'Professor 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.) 



2 In the fall of 1921 the author had the opportunity to examine arctic Euphyllopoda intiie 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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