The Decapod Crustaceans of the Canadian Arctic Expedition 



1913-18. 



By Mary J. Rathbun, 



Associate in Zoology, United States National Museum. 



The known range of several species is extended by the specimens obtained 

 by the Canadian Arctic Expedition. Five of the species of Spirontocaris are 

 shown to have a more complete circumpolar distribution, while Paralithodes 

 camtschaticus is recorded for the first time from the Arctic (occurrence possibly 

 accidental), and Pagurus brandti seems to reach as far north in Bering sea as 

 Norton sound. Attention is called to the distributional charts of von Hofsten 

 (see bibliography) in some of which notable gaps are filled or reduced by the 

 new data here published. 



As nearly all of the species of shrimps collected by the Canadian Arctic 

 Expedition were described and their synonymy worked out in the author's 

 report on the decapod crustaceans of the Harriman Alaska expedition (see 

 bibliography), a reference to that work is made under each of those species in 

 the list below. 



It may be noted that the care with which the specimens were obtained and 

 - preserved is due to Mr. Frits Johansen, naturalist of the expedition. 



List of the Species. 

 Order Decapoda. 

 Suborder Natantia. 



Superfamily PANDALOIDA. 



Family PANDALIDyf). 



Genus Pandalus Leach. 



Pandalus goniurus Stimpson. 



(Rathbun, 1904, p. 38, pi. I, fig. 3.) 



Off point Lay, Arctic Alaska; lat. 69° 35' N., long. 163° 27' W.; 11-12 

 fathoms; rock and sand, with algse; August 17, 1913; station 22; twelve speci- 

 mens. 



Distribution. — Arctic coast of Alaska southward through Bering sea t& 

 Okhotsk sea and to Puget sound. 3-100 fathoms. 



Superfamily PALAEMONOIDA. 



Family HIPPOLYTID^., 



Genus Spirontocaris Bate. 



Spirontocaris groenlandica (J. C. Fabricius). 



(Rathbun, 1904, p. 61.) 



West of Cockburn point. Dolphin and Union strait, Northwest Territories; 

 15-20 fathoms; sandy mud, with Stones and algae; September 14, 1915; station 

 43c; three specimens. 



Vol. vii— 46454— U 



