The Amphipods of the Canadian Arctic Expedition, 1913-18. 



By Clarence R. Shoemaker 

 Division of Marine Invertebrates, U. S. National Museum 



The marine and freshwater amphipods collected by the naturalist of the 

 southern party of the Canadian Arctic Expedition, Mr. Frits Johansen, are for 

 the most part well-known arctic forms, but one, a species of Synurella, is new to 

 science, this genus now appearing for the first time in American waters. 



Katius obesus was known from the Atlantic only on the strength of two 

 specimens, until thirty-five were taken off the southwestern coast of Greenland 

 by the Tjalfe Expedition in 1908-9; it appears now for the first time in the 

 Pacific. 



The known ranges of several species have been greatly extended by the 

 records in the collection under consideration ; the details will be given under the , 

 species involved. 



The collection contains fifty-three species included in forty-one genera 

 which are distributed among eighteen families; the family Lysianassidse, as 

 would be expected in an arctic collection, is represented by the greatest number 

 of genera, species, and individuals. 



An appendix has been added consisting of data based upon specimens from 

 the Neptune and other Canadian expeditions. 



The color notes given under some of the species are based upon colored 

 sketches made by Mr. Frits Johansen. The color nomenclature is based upon 

 Ridgway's "Color Standards and Nomenclature." 



Order Amphipoda. 



SUB-OKDBB GaMMARIDBA. 



Family LYSIANASSID^. 



1. Anonyx nugax (Phipps). 



1774. Cancer nugax Phipps, Voy. North Pole, p. 192, pi. 12, f. 2. 



1906. Anonyx nugax+A. lagena Stbbbing, Tierreich, Amph. I, p. 54, and synonymy. 



1911. Anonyx nugax Staffers, Crust. Malacost., Campagne Arctique de 1907, du Due 



d'0rl6ans, p. 8. 

 1913. Anonyx nugax Stbphensbn, Conspectus Crust, et Pycnog. Groenl., p. 115. 



Station 29/: 70° 13' N., 140° 50' W., April 4, 1914, from stomach of Phoca 

 hispida Schreber, water depth about 30 fathoms; 6 specimens. 



Station 43a.- Dolphin and Union strait (off Cockburn point). Northwest 

 Territories, September 13, 1915, 50 fathoms, mud with pebbles, but no algse; 

 2 specimens. 



Station 46e; Dolphin and Union strait (off Bernard harbour). Northwest 

 Territories, February 16, 1916, 6 fathoms; 300 specimens. 



Station 46gf; Dolphin and Union strait (Bernard harbour), Northwest 

 Territories, May 4, 1916; from Eskimos; 7 specimens. 



Distribution. — This species is very widely distributed, being found through- 

 out the Arctic, North Atlantic, and North Pacific oceans. 



2. Hippomedon holboUi (Kroyer). 



1846. Anonyx holboUi Kroybr, Naturh. Tidsskr., ser. 2, vol. 2, p. 8, 38. 

 1906. Hippomedon holboUi Stbbbing, Tierreich, Amph. I, p. 58, and synonymy. 

 1911. Hippomedon holboUi Stappers, Crust. Malacost., Campagne Arctique de 1907, du Du 

 d'0rl6ans, p. 6. 



Vol. vii— 67920— 11 



