192!] Schmitt: The Marine Decapod Crustacea of California 251 



Key to the California Species of Pinnotheres 



I. Palp of outer maxillipeds small, much less than half as large as merus. 



Carapace wider than long. Dactyls of ambulatory legs falcate, terminating 



in slender, curved, corneous tips ; dactyls of second pair of ambulatory legs 



the longest. Male unknown. (Known only from the type locality, Pacific 



Grove.) 



holmesi, p. 251. 



II. Palp of outer maxillipeds large, nearl}' half as large as merus. 



A. Carapace wider than long, though nearly square; with rounded corners; 



naked. Dactyls of ambulatory legs nearly straight, those of fourth 



pair of ambulatory legs longer and more slender than the others. 



Male unknown. (From Monterey and Santa Cruz, not found since 



these two records were made by Holmes.) 



nudus, p. 252. 



B. Carapace as long as or longer than wide. Dactyls of ambulatory legs 



falcate, terminating in slender, curved, corneous tips; dactyls similar. 



concharum, p. 252. 



Pinnotheres holmesi Rathbun 



Plate 39, figures 7 and 8 



?Pinnotheres nudus Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 53, 



fig. 1, 1910 ; not P. nudus Holmes, 1895. 

 Pinnotheres holmesi Eathbun, Bull. U. S. Nat. Mus., 97, 68, text fig. 31, 

 pi. 15, figs. 1-2, 1918. 



Original Description of Female. — Carapace very soft and yielding, broader 

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

 posterolateral margins short, oblique, concave ; posterior margin long, concave ; 

 greatest width in posterior half ; carapace convex, thick, rounding gradually down- 

 ward, except posteriorly; gastric region defined by a depression. . . . Front between 

 orbits truncate, 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 through- 

 out, rounded at extremity, inserted near proximal end of propodus and not reach- 

 ing its distal end. 



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

 propodus nearly straight, palmar portion widening rapidly to a point behind 

 base of fingers ; fingers stout, hooked at tips, prehensile edges uneven, an acute 

 tooth near base of dactyl. 



Belative length of [ambulatory] legs represented by 2, 3, 1, 4, the second 

 longest; 2, 3, and 4 very slender; dactyl 2 much 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 leg stout, especially propodus, not reach- 

 ing middle of propodus of second; 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 (Eathbun). 



Dimensions. — Type, female: length of carapace 7.2 mm.; width 8.7 mm. 



Type Locality. — Probably Pacific Grove; known only from a single ovigerous 

 female specimen. 



