44 



TRUE CRABS OF MONTEREY BAY 



angle of basal joint produced, acute and plainly visible from above, 

 reaching about as far forward as median tooth of front. 



Merus of maxillipeds abruptly truncated, inner angle slightly pro- 

 duced, inner margin with a conspicuous tooth below the articulation of 

 palp. Exognath stout, reaching to end of merus. 



Chelipeds hairy, carpus with a conspicuous spine near hinge, another 

 inside of this terminating a slight ridge and reaching well forward, and a 

 third below this on the inner side. This latter tooth is more conspicuous 

 than in any other species with the possible exception of gracilis. Upper 

 surface of carpus with a few reddish spines, upper surface of hand with 

 two rows of three to five spines, outer surface with 5 costae marked with 

 hair and small spines, upper margin of dactyl spiny. Fingers meeting 

 along most of their length, armed with conspicuous teeth. Ambulatory 

 legs hairy, dactyls slightly longer than the propodi, straight, tipped with 

 nearly straight corneus spines. 



Abdomen of 7 joints, regularly tapering from the third to the tip; 

 terminal joint long and slender, reaching nearly to the anterior border of 

 the coxae of the chelipeds. 



Color whitish marked with irregular but symmetrically disposed 

 reddish blotches, tips of fingers of chelipeds black, ambulatory legs light 

 banded with red. 



Since writing the above description another and still larger specimen 

 of this species, also dredged from about 10 fathoms in Monterey Bay, has 

 come into my hands. As it differs somewhat from the preceding it seemed 

 well to add the following points. Although the proportion of width to 

 length in the carapace is almost exactly that of the one described (46 by 

 32.5 mm.), it appears wider, as the lateral teeth are much shorter. The 

 areolation is distinct but rather less deep than in the former case, the 

 pubescence is similar though a trifle more dense, and there is a tendency 

 towards tufts of seta and granules on the prominences of the carapace 

 which is barely indicated in the other. The antero-lateral teeth are similar 

 but less acute and projecting and with more pronounced secondary denti- 

 culations. The teeth of the front are less acute and prominent, especially 

 the supra-orbital. Chelipeds similar but even more markedly spiny. 

 General color reddish, due to light red marblings on a whitish ground. 



As pointed out before, the young of this species closely resemble the 

 young of C. gracilis. The large specimen at hand shows an almost equally 

 striking resemblance to the hairy form of C. antennarius noted under that 

 species, lending some color to the supposition that that form may repre- 



