164 Bulletin, Vandcrhilt Marine Museum, Vol. Ill 



deposited in tlie Peabody Museum, Yale University. (See Bull. U. S. 

 Geol. and Geograph. Surv. of the Territories, vol. IV, 1876, p. 196.) 



Technical description: Female: Carapace 7 mm. long, abdomen 

 about 10 mm. long. The rostral tooth is short, acute, smooth, deflected ; 

 the orbital spines or teeth are very weak, deflected, being scarcely 

 more than an emargination in the orbital lobe, but more clearly seen 

 in a lateral view. Eyes small, circular, sharply defined but not pro- 

 jecting on the dorsal surface as convex protuberances, situated behind 

 the frontal margin by a distance equal to, or a trifle greater than, the 

 diameter of the cornea. The abdomen is glabrous, somewhat com- 

 pressed laterally, with the epimeral plates very well developed and 

 rounded in the female. The telson is about one and one-half times as 

 long as the preceding segment, tapered, the distal margin being 

 scarcely half the mdth of the proximal margin, rounded and ciliated. 

 There are two pairs of submedian, articulated spines on the dorsal 

 surface of the telson. Both blades of the caudal fan are broadly oval, 

 the margins ciliated ; the outer blade is the wider, with a subdistal 

 spine on the outer lateral margin. 



The antennulae have the basal article dorsally flattened, nearly as 

 wide as long, constricted distally; the second article is one and one- 

 third times longer than the first, slender, cylindrical ; the third article 

 is similar to the second but scarcely half as long and supports a bira- 

 mose flagellum, the longer, slenderer, inner branch reaching to the 

 base of the hinged finger of the great chela; the thicker branch not 

 over half so long and with a dense brush of furry short setae on the 

 under side. 



The antennae have the basal article short, the scaphocerite as long 

 as the peduncular articles of the antennulae and also the same length 

 as the carpoeerite of the antennae. This scaphocerite is slender, thick- 

 ened, acuminate, with the outer margin curved, concave, much thick- 

 ened ; the inner lateral margin is convex proximally, tapered distally, 

 the usual laminate portion of the scaphocerite is nearly obsolete. The 

 second peduncular article of the antennae is short, the carpoeerite is 

 long, slender, cylindrical, extending as far forward as the antennu- 

 lar peduncle and the scaphocerite. This ratio is distinctly different 

 from that of the Pacific Coast analog, C. cylindricus Kingsley, in which 

 the scaphocerite reaches only to "the extremity of the second joint 

 of the peduncle of the antennulae." The antennal flagellum is very 

 fine and reaches beyond the extended great cheliped by a distance 

 about equal to the length of the propodus of the latter. 



