THE GKAPSOID CKABS OF AMERICA. 



167 



Description of male. — Carapace smooth; cardiac region a trans- 

 verse rounded elevation; sides subtruncate, antero-lateral angles 

 rather prominent; front deflexed, advanced; antero-lateral margin 

 sharp, from hepatic region backward ; posterior margin little wider 

 than base of abdomen. 



Chelae pubescent ; upper and lower margins of manus convex ; fin- 

 gers subconical, horizontal, curving toward each other near tips, 

 edges sinuous, meeting, tips crossing. 



Legs pubescent especially last 2 segments, propodi convex on both 

 margins; first leg narrow, propodus no longer than wide, dactylus 

 long and nearly straight ; second leg wider, but similar, reaching end 

 of propodus of third leg; third leg wide, dactylus slightly curved; 

 fourth leg similar but smaller, reaching middle of carpus of third. 



Abdomen with first segment very wide at base, its sides very 

 oblique; second to sixth segment gradually diminishing, sixth con- 

 stricted at middle ; seventh short, margin broadly rounded. 



Fig. 104. — PiNNixA weymouthi, male holotype. a, Odteb maxilliped, x 20 ; &, left 



CHELA, X 71, AFTER WEYMOUTH ; C, ABDOMEN, X 16. 



Description of female. — The female referred here is about the same 

 size as the male but has a thin shell, so that its shape is not well 

 defined. Front less advanced and antero-lateral margin less sharply 

 marked than in male. Chelae not pubescent outside, similar in shape 

 to those of male, except that the thumb is a little shorter. Legs as in 

 male. 



Measurements. — Male holotype, length of carapace 3.3, width of 

 same 5.3 mm. 



Range. — Monterey Bay, California. Beach to 5 fathoms. 



Material examined. — Monterey Bay, California, off Monterey 

 wharf; 5 fathoms; June 28, 1907; 1 male holotype (Stanford Univ.). 

 Third Beach, Pacific Grove, California ; free on the beach ; June 26, 

 1907; 1 female ovig. (Stanford Univ.). 



Affinities. — Related to P. tuhicola., schmitti, and hiatus, all of which 

 have smooth carapaces, swollen palms, and nearly straight dactyli 

 of the legs; iveymouthi is narrower, its sides truncated, and antero- 

 lateral angle more prominent. The male abdomen of tuhicola is 

 more triangular, that of schmitti has more convex margins than in 

 weymouthi. 



