70 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



PINNOTHERES GEDDESI Miers. 



Plate 16, figs. 1-4. 

 f Cancer 1. The Oyster-Crab, Buowne, Civil and Nat. Hist. Jamaica, 1756, 



p. 420. 

 Pinnotheres angelicus Miees, Jouru. Linn. Soc. London, Zool., vol. 15, 1880, 



p. 86 ; not P. angelicus Lockington, 1877. 

 Pinnotheres geddesi SIiers, Journ. Linn. Soc. London, Zool., vol. 15, 1880, 



p. 86 (type-locality, Vera Cruz; cotypes in British Mus.). 

 Pinnotheres ostrearius Rathbun, Bull. U. S. Fish Comm., vol. 20, for 1900, 



pt. 2 (1901), p. 20, text-fig. 3 (type-locality, Mayaguez, Porto Rico, in 



an oyster from near Cabo Rojo ; holotype. Cat. No. 23767, U.S.N.M.). 



Diagnosis. — Near ostreuni. Propodus of first leg of female of 

 nearly same width throughout. Palm widest at distal end. Cara- 

 pace very thin. 



DescHption of female. — Carapace very thin and yielding, trans- 

 versely suborbicular, broad behind. Gastric region distinctly out- 

 lined by a furrow, cardiac region less distinct. Front rounding 

 downward, slightly projecting, truncate in dorsal view. Orbits cir- 

 cular, eyes partly visible in dorsal view. 



Merus of outer maxillipeds robust, outer margin regularly convex, 

 inner margin with bluntly rounded angle near distal extremity; 

 carpus and propodus robust, the latter rounded and ciliated at distal 

 end; dactyl very slender, styliform, reaching about to extremity of 

 propodus. 



Fig. 32. — Pinnotheres geddesi, female (23767). a. Chela, X 16; 

 b, outer maxilliped, X 16. 



Chelipeds smooth; palm rapidly increasing in width from proxi- 

 mal to near distal end, which articulates very obliquely with the 

 dactylus; upper margin convex at widest part, lower margin of 

 entire propodus convex; fingers subconical, somewhat hairy, edges 

 meeting and tips crossing when closed. 



. Legs slender; first one stouter than the others, propodus scarcely 

 widening distally, dactylus about half as long, stout, anterior margin 

 convex, posterior straight; second leg longest, third subequal to first; 

 fourth reaches about to middle of propodus of third ; dactylus of sec- 

 ond leg long, curved, about two-thirds as long as propodus ; dactylus 

 of third leg shorter, of fourth still shorter, straighter and more hairy ; 

 third dactylus nearly straight behind, fourth quite straight behind. 



Measurements. — Female cotype, length of carapace 9, width of 

 same 10.8 mm. 



