CALIFORNIA STALK-EYED CRUSTACEA. 51 



Carapace gently convex, undulated, and covered with small granulations 

 which are larger on the summits of the prominences. Two or three 

 curved rows of light colored spots on the antero-lateral regions. Front 

 not produced, the three median teeth small, the middle one being slightly 

 the largest and projecting further forward than the others; outermost pair 

 larger than the others, not reaching so far forwards, and separated from 

 them by a considerable interval. No tooth on the superior orbital margin. 

 Basal antennal joint large, its pointed extremity projecting much further 

 forward than the outer tooth of the front. A small tooth on the inferior 

 margin of the orbit just external to the basal antennal joint. Antero- 

 lateral margin armed with ten distant teeth which decrease in size and 

 become more closely set anteriorly; the teeth are triangular in shape and 

 the margin between them is denticulated or sharply granulated; the pos- 

 terior tooth is the largest of the series, its anterior margin is generally 

 transverse and its posterior margin continuous with the postero-lateral 

 margin of the carapace. Postero-lateral margin nearly straight (the 

 anterior part slightly convex, the posterior a little concave) and devoid of 

 a tooth or projection behind the large lateral tooth. Merus of the maxilli- 

 peds very obliquely truncated at the distal end, the antero-internal angle 

 rounded, and the inner margin concave (not deeply notched) behind the 

 articulation of the palp. Chelipeds slightly unequal; rnerus armed with 

 two teeth at the distal end, one on the margin, and one a short distance 

 behind it; the outer surface of the carpus furnished with granulated 

 ridges, the upper one running to a sharp spine at the antero-internal 

 angle; upper surface of the hand furnished with a prominent crest, which 

 is cut into numerous sharp teeth; outer surface with five longitudinal, 

 granulated costse; fingers more slender than in the preceding species and 

 furnished with more numerous teeth; dactyl armed with a dentate crest 

 on the upper margin. Legs granulated, carpi sulcate above; dactyls 

 strongly compressed, those of the fifth pair widened. 



Length of adult specimen 78 mm. 



Breadth of adult specimen 106 mm. 



Alaska, Queen Charlotte Island (Smith), Puget Sound, 

 Oregon, northern to Lower California. 



This species is common in and around San Francisco 

 Bay, where it is caught in large numbers for food. It 

 is the common crab of the markets. 



