CALIFORNIA STALK-EYED CRUSTACEA. 39 



" Body flattened above, punctured, somewhat hairy; sides spinous, 

 especially anteriorly; rostrum very short; feet spinous above; hand of the 

 anterior pair with only a few very small spines at the base; pincers with- 

 out teeth, except toward their apices, where for one-third of their whole 

 length thej" are hollowed out on their prehensile side, so that when 

 closed they become interlocked at their extremities by means of their 

 serratures. Length of carapax about one inch." 



One specimen from Western America. 

 Genus Chioncecetes Krdyer. 



Carapace broad, depressed, more or less tuberculated or spinose. Eos- 

 trum short, flattened and notched, not depressed. Orbits shallow, open 

 above so that the short, thick ej'^e-peduncles are visible from above when 

 retracted. Nopreorbital spine; postorbital present. Basal antennal joint 

 very narrow, with a terminal spine; second and third joints not dilated; 

 flagellum ghort. Ambulatory legs more or less compressed and of moderate 

 length. Abdomen seven-jointed. 



Type. — C. opilio (Fabr.). 



Chioncecetes opilio (Fabr.) 



Cancer phalangium O. Fabricius, Fauna Groenlandica, 1780, p. 234. 

 Cancer opilio O. Fabricius, Danske Vid. Selsk. Skr, nye Saml., Band. Ill, 



1788, p. 181, plate. 

 Chioncecetes opilio Kroyer, Naturh. Tidskrift (1), 2, 1838, p. 249. 

 Chioncecetes hehringianus Stimpsox, Proc. Bost. Soc. Nat. Hist., Vol. VI, 



1856, p. 84; Journ. Bost. Soc. Nat. Hist., Vol. VI, 1857, p. 449. 



For further references see Rathbun, Proc. U. S. Nat. 

 Mus., Vol. XVI, 1893, p. 74. 



This species extends from Greenland to Behring Sea 

 and down the west coast of America as far as British 

 Columbia, and may, not improbably, occur within our 

 limits. The carapace is flattened and covered with 

 wart-like tubercles. There is no deep depression sepa- 

 rating the branchial regions. The ambulatory legs are 

 shorter, stouter and less spiny than in the next species. 



