128 University of California Publications in Zoology [Vol.23 



base, about twice the length of the upper side of the propodi, strongly twisted, and 

 armed only with very short, corneous spinules. 



Dimensions. — Type : length 114.3 mm., large cheliped 11 mm. longer than 

 smaller one. Length of carapace of the single Bay specimen 28 mm. 



Color. — General color yellowish white, the antennae are blue and the anterior 

 portions of the carapace have more or less the same coloration; a peculiar reddish 

 coloration occurs in different parts of the body, notably on either side of the 

 cardiac area of the carapace (Holmes). 



Type Locality. — Off San Diego, California, dredged in 25 fathoms. 



Distribution. — San Francisco to San Diego, California, to a depth of about 

 30 fathoms. 



Biological Survey of San Francisco Bay. — In the collection there 

 is a single specimen, without a label, undoubtedly taken outside the 

 bay. 



II. External maxillipeds widely separated at the base. Eight cheliped larger 



than the left. 



Key to the California Species of Pagurus, Pylopagurus, and Parapagurus 



I. Dactyls of second and third pairs of legs more or less strongly twisted, longer 

 than anterior portion of carapace, often nearly as long as entire cara- 

 pace. 



A. Large hand with a prominent longitudinal ridge, forming one side of 



a median subtriangular area, each side of which the palm is deeply 

 excavate; large surface of small hand oblique, triangular and also 

 deeply excavate. (Off California, known only from 211 + fathoms.) 



Pagurus tanneri, p. 133. 



B. Large hand not ridged or excavated, upper surface spiny, flat or convex; 



inconspicuously or long haired. 



1. Large surface of small hand horizontal; hair on hands short, not 



reaching to end of spines. 



Pagurus ochotensis, p. 130. 



2. Large surface of small hand triangular, oblique; hair on hands 



mueh longer than, and practically obscuring, spines. (Off Cali- 

 fornia, known only from 240 + fathoms.) 



Pagurus capillatus, p. 132. 



II. Dactyls not twisted. Small hand more or less swollen ; large surface more or 



less triangular, oblique or vertical; hand in some cases subcylindrical. 



A. Upper surface of large hand strongly spined; spines in seven longi- 



tudinal rows; both hands thickly set with stiff bristles. (Off Cali- 

 fornia, known only from 266 -f- fathoms.) 



Pagurus setosus, p. 136. 



B. Upper surface of large hand granulate or smooth, rarely sharply (spini- 



form) granulate; sparsely if at all hairy. 

 1. Dactyls at most but little if any longer than anterior (firm or hard) 

 portion of carapace; never more than one-third again as long. 

 a. Large hand with upper surface convex, more or less evenly 

 rounded. 

 i. Small hand not very feeble, at least one-half as wide as great- 

 est width of large hand. 



