The Schizopod CrustEiceans of the Canadian Arctic 

 Expedition, 1913-18. 



By Waldo L. Schmitt. 



With three figures in the text. 



In all, only three Mysids and three Euphausids were taken. Of the former 

 one is apparently new to science. It is described and named in honour of 

 Dr. R, M. Anderson, leader of the southern party of the expedition. 



Of these six species the most frequently encountered was the common 

 My sis ocUlata (Fabr.), found in all arctic seas and the northerli part of sub-arctic 

 regions. 1 This confirms at least one of the four schizopod records given by 

 Richters for the Bering sea.^ The other three not represented in the present 

 collection were: Stilomysis> Mysideis grandis (Goes); Pseudomma truncatum 

 Smith; and Meganyctiphanes> Thysanopoda norvegica (Sars)? Concerning the 

 last of these Hansen says, " Richters' statement, with a query, about its occur- 

 rence in Bering sea is undoubtedly wrong^; of each of the other two he remarks 

 that though the locality is not improbable, its correctness ought to be confirmed.* 



My sis relicta Loven, the well-known relict of the fresh-water lakes of boreal 

 Europe, heretofore reported from North America only from lakes Superior, 

 Michigan (12^148 fathoms)^, and Erie', Green lake, Wisconsin (17-49 meters)', 

 and Indian harbour, Labrador (fresh-water)^, is now to be listed from Bernard 

 harbour, Northwest Territories, where it was taken by Mr. Frits Joliansen "from 

 the stomach of Cristivomer namaycush (Walbaum), caught in lake, inland." 



Neomysis andersoni, the new species is known only from the type locality, 

 Grantley harbour, port Clarence, Alaska. 



Thysanoessa longipes Brandt, originally described from the sea of Okhotsk 

 and since " taken at no less than fourteen places in the colder temperate north 

 Pacific and Bering Sea,"' has its range extended into the Arctic ocean as far 

 as cape Smythe (point Barrow), Alaska. 



Thysanoessa inermis (Kr<^yer), though not taken farther to the eastward 

 along the Arctic coast of North America than 140° 51' W., by this expedition, is 

 practically circumpolar in its distribution, having been taken also at Spitzbergen, 

 in the Kara sea, and Franz Joseph Land. In addition, it is rather widely dis- 

 tributed in the northern north temperate regions of the Atlantic, from the 

 British Isles and Vineyard Sound northward into the Arctic ocean and Davis 

 strait, and in Bering sea and adjacent area of the North Pacific."^" 



> Thysanoessa raschii (Sars) in its distribution approximates that of Thysan- 

 oessa inermis. It, however, does not range quite as far south in the North 

 Atlantic, never having been taken south of Scotland, or cape Cod. On the other 

 hand, it has been found both farther to the south in the North Pacific, as far 

 as 39° 25' N, (150° 28' W.)" and farther to the eastward in the Pacific Arctic, 



1 Zimmer, Nordisches Plankton, VI, 162, 1909. 



2 Richters, Abh. senckgnsb. naturf . Ges., XIII, 406, 1884. 



3 Hansen, Proc. U. S. Nat. Mus., 48, 70, 1915. 



^ Hansen, Danish Ingolf, Exped., Ill, 111 and 114, 1908. 



6 Smith, Rapt. U. S. Fish Comm., 1872-73, 643, 1874. 



« Kellicott, of. Joum. Royal Micros. See, II, 152, 1879. For a complete bibliography of 

 this species to 1905, see Samter, Abh. K. preus. Akad. Wissen., Berlin, 1905, Abh. V. 



' Marsh, Zool. Anz., XIV, 275, 1891, and Amer. Nat., XXVIII. 



* Rathbmi, in '' Labrador " by Grenfell et al, Appendix II, 452, 1909. 



9 Hansen, Proc. U. S. Nat. Mus., 48, 90, 1915. 

 '° Hansen, Proc. U. S. Nat. Mus., 48, 94^96, 1915. 

 " Hansen, Proc. U. S. Nat. Mus., 48, 97, 1915. 



