148 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



Color in life: Dusky brick red above, whitish below. (Stimpson, 



1907) 



Habitat: Green mud, black mud; fine gray sand, gravel. (Rathbun, 



1925) 



Depth: 12-121 fathoms; slightly shallower on the Asiatic side. 



Breeding: Ovigerous females were encountered by the Albatross 

 off the Pribilof Islands and off Kamchatka in June, and by G. E. Mac- 

 Ginitie off Point Barrow in the Arctic Ocean in August, September, and 

 October. 



Remarks: The above account is intended to apply only to the sub- 

 species, Hyas coarctatus alutaceus, as it alone occurs within the territory 

 under consideration, the American Pacific. For a more complete synonymy 

 and a description of the parent species, Hyas coarctatus Leach (1815b, 

 p. 329) of the Atlantic, and of the subspecies H. c. ursinus Rathbun 

 (1924a, p. 4), of the Japan Sea, see Rathbun (1925, p. 258). 



The discrepancy in the two brief descriptions above, the one by 

 Brandt and the other by Stimpson, concerning the relative amount of 

 tuberculation of the carapace as compared to typical Hyas coarctatus, is 

 more apparent than real, since it may be accounted for within the normal 

 range of variation of the subspecies. The figures by Birula (1910) of 

 Brandt's original specimens, a female obtained by Captain Midden- 

 dorff in the Okhotsk Sea and a carapace found by Wosnessensky at 

 Cape Espenberg, Kotzebue Sound, Arctic Alaska, leave no doubt as to 

 the identity of Stimpson's material with Brandt's. 



Specimens obtained by G. E. and Nettie MacGinitie at Point Bar- 

 row, Arctic Alaska, in late summer, 1949, are of special interest in 

 view of Murdoch's statement (1885, p. 137) that three large males 

 picked up on the beach near the station at Point Barrow by the Inter- 

 national Polar Expedition, when compared with Stimpson's types of 

 Hyas latifrons, proved to be indistinguishable from them, and differed 

 from typical H. coarctatus from Greenland only in the shape of the 

 rostrum, which is slightly shorter and less acute. 



Genus CHIONOECETES Kroyer 



Chionoecetes Kroyer, 1838, p. 249. Holmes, 1900, p. 39. Rathbun, 



1925, p. 232. 

 Peloplastus Gerstaecker, 1856, p. 102 (published April, 1857, fide 



Stimpson); type P. pallasi Gerstaecker, 1856 (1857) = Cancer 



opilio O. Fabricius, by monotypy. 



