158 CALIFORNIA ACADEMY OF SCIENCES. 



than one-half the length of the antennae, the flagella subequal. Peduncle 

 of the antennae exceeding that of the antennules; flagellum ciliated and 

 longer than the carapace. Chelipeds equal; merus spinulous and hairy 

 below; carpus with the upper and lower edges spinulous, and having a 

 spine at the antero-internarangle and another spine a short distance below 

 it; hand with two parallel, scabrous, hairy lines on the upper edge and a 

 transverse granulated line at the proximal end of the inner surface; a line 

 of hairs on the outer surface which is continued obliquely across the 

 carpus; lower side of the palm scabrous and hairy; poUex short, bent 

 downwards, and having a tooth near the middle; dactyl obliquely com- 

 pressed, incurved, acute, projecting, when closed, far beyond the tip of 

 the pollex. Uropods short, the inner ramus distally rounded, truncated, 

 the outer rounded. Telson entire, rectangular, wider than long. 

 Length, 112 mm. 



Queen Charlotte Is. (Smith); Vancouver's Is. (Bate); 

 Puget Sound (Dana); Bodega Bay! San Francisco Bay! 

 Monterey! Santa Catalina Is.! San Pedro! San Quentin 

 Bay, Lower California (Lockington). 



This species can generally be found wherever muddy 

 beaches occur. It inhabits holes of one or more feet in 

 depth, many of which are left uncovered at low tide, 

 when the creatures can easily be dug out. Specimens 

 are often taken, however, at a depth of several fathoms. 



There is a peculiar parasitic crustacean, Phyllodurus 

 abdominalis St., that is often found upon this species, 

 being usually attached to the base of the abdominal 

 appendages. Sometimes also a small bivalve mollusc, 

 Pythina rugifera, is found attached to this crustacean 

 by its byssus. 



The tooth on the pollex is sometimes absent, as it was 

 in the specimen described by Dana. ''This tooth," 

 says Stimpson, ''is a prominent character in all the 

 very numerous specimens in the Smithsonian Museum, 

 but it is obsolete in the speciinen described by Dana, 

 although actual comparison shows them to be the same." 

 In some small specimens from Catalina Island the small 



