THE GRAPSOID CRABS OF AMERICA, 



137 



PINNIXA LONGIPES (Lockington). 



Tubicola longipcs Lockington, Proc. California Acad. Scl., vol. 7, 1876 

 (1877), p. 55 [1] (type-locality, Tomales Bay, California, In tube of 

 annelid; type not extant). 



Pinnixa longipes Lockington, Proc. California Acad. Sci., vol. 7, 1876 

 (1877), p. 156 [12]. — Streets and Kingsley, Bull. Essex Inst., vol. 9, 

 1877, p. 107. — Holmes, Proc. California Acad. Sci., ser. 2, vol. 4, 1894, 

 p. 573, pi. 20, figs. 39 and 20; Occas. Papers California Acad. Sci., vol. 

 7, 1900, p. 92.— Rathijun, Harrinmn Alaska Exped., vol. 10, 1904, p. 

 ISS. — Weymouth, Leland Stanford Jr. Univ. Publ., Univ. Ser. No. 3, 

 1910, p. 58, text-fig. 6 (part; not 2 young specimens from Monterey 

 Bay). 



Diagnosis. — Carapace nearly three times as wide as long. Third 

 leg vastly larger than the others; fourth leg not reaching beyond 

 merus of third. 



Fig. 80. — Pinnixa longipes, cotype, geneu^l outline, enlaugkd. (After Holmes.) 



Description. — Carapace more than 2^ times as wide as long, some- 

 what flattened above, a depression behind the gastric region. A 

 transverse groove just behind margin of front. 



Chelipeds small, short, hairy; chelae ovate-oblong, distally taper- 

 ing, upper margin convex, lower margin 

 nearly straight, distally granulate; fin- 

 gers subequal, subacute, fitting close to- 

 gether, a subbasal tooth on dactylus, a 

 median tooth on thumb, and a subtermi- 

 nal notch into which the point of the 

 dactylus fits. 



First two legs slender and similar, 

 with slender dactyli, the first leg the 

 smaller. Third leg enormously devel- 

 oped, longer than width of carapace, 

 merus thick, flat, and w'ith a kind of 

 flange on posterior margin; dactyl short, 

 thick, curved, and shorter than the tapering propodus. Fourth leg 

 shortest of all, not reaching bej'^ond merus of third, broad, fringed 

 with long hair, dactylus less curved than that of third leg and 

 shorter than propodus. 



Fio. 81. — Pinnixa loxgipes, co- 

 type, OUTER MAXILLIPED, EN- 

 LARGED. (Afteu Holmes.) 



