THE GBAPSOID CRABS OF AMERICA. 69 



Diagnosis. Carapace of female soft, broadest behind, gastric re- 

 gion defined. Manus widest a little way behind fingers. Leg 1 stout, 

 widest distal to middle; legs 2, 3, and 4 very slender and diminishing 

 in order named. 



Description of female. Carapace very soft and yielding, broader 

 than long, the front and long antero-lateral margins forming a single 

 arch; postero-lateral margins short, oblique, concave; posterior mar- 

 gin long, concave ; greatest width in posterior half ; carapace convex, 

 thick, rounding gradually downward, except posteriorly; gastric 

 region defined by a depression, which is deeper and narrower than 

 in ostreum, and suggests that in Fabia. Front between orbits trun- 

 cate, medially faintly emarginate, orbits partly visible from above. 



Carpus of outer maxilliped suboblong; propodus no longer than 

 carpus, and narrower, end obliquely rounded; dactylus linear, of 

 nearly even width throughout, rounded at extremity, inserted near 

 proximal end of propodus and not reaching its distal end. 



Chelipeds stouter than legs, but not very large; lower margin of 

 propoclus nearly straight, palmar por- 

 tion widening rapidly to a point be- 

 hind base of fingers; fingers stout, 

 hooked at tips, prehensile edges un- 

 even, an acute tooth near base of 

 dactyl. 



Relative length of legs represented 



by 2.3.1.4, the second longest; 2, 3, Flo . ~3iT PINNOTHERES HOLMESI, 

 and 4 very slender; dactyl 2 much OUTEK MAXILLIPED OP FEMALE 



j j HOLOTTPE, X 15J. 



longer than 3 or 4 and curved on 



both margins, dactyl 3 less curved on anterior and nearly straight 

 on posterior margin, dactyl 4 a trifle longer than 3, margins nearly 

 straight ; horny tips of all four very slender and hooked. First kg 

 stout, especially propodus, not reaching middle of propodus of sec- 

 ond; propodus widest distal to the middle and narrowest at distal 

 extremity ; dactyl shortest of all, conical except for tip. 



Abdomen voluminous, much longer and wider than carapace. 



Measurements. Female holotype, length of carapace 7.2, width of 

 same 8.7 mm. 



Range. Known only from the type-locality, which is probably 

 Pacific Grove, California. 



Affinity. In shape resembles P. ostreum of the Atlantic coast, 

 which has also a similarly enlarged propodus of first leg; first 3 

 legs of holmesi much slenderer than of ostreum. 



