THE GKAPSOID GRABS OF AMEBICA. 



141 



Sexual variation. — The only female at hand is immature and much 

 smaller than the type male. The fingers are longer in proportion 

 to the palm than in the male and the propodal finger is slightly 

 deflexed ; there is no spine at distal end of ischium of third leg ; the 

 fourth leg reaches slightly beyond the merus of the third leg. 



Measurements. — Male holotype, length of carapace 4.2, width of 

 same 7, length of third leg 10.5 (approx.) mm. 



Range. — Chesapeake Bay ; 20 fathoms. 



Material examined. — 



Chesapeake Bay ; 20 fathoms ; soft bottom ; Apr. 25, 1916 ; station 

 8528, steamer Fish Hawk; 1 male holotype (50167). 



Chesapeake Bay ; 20 fathoms ; sft. m. ; Apr. 25, 1916 ; station 8522, 

 steamer Fish Hawk; 1 female paratype (49641). 



A^nity. — Allied to P. fioridana in the character of the chelipeds 

 and in lacking a carina on the carapace. Differs in the narrower 

 legs and in the presence of a long spine on the ischium of the 

 third leg. 



PINNIXA TOMENTOSA Lockineton. 



Plate 30, fig. 8. 



Pinnixa f nitida Lockington, Proc. <Jalifornia Acad. Scl., vol. 7. 1876 



(1877), p. 155 [11], part (female). 

 Pinnixa tnmcntom Locicington, Proc. California Acad. Scl., vol. 7, 1876 



(1877), p. 156 [12] (type-locality, Angeles Bay, Gulf of California; 



type not extant). — Holmes, Proc. California Acad. Scl., ser. 2, vol. 4, 



1894, p. 568, pi. 20, figs. 11-13. 



Diagnosis. — Propodus of last two legs nearly square, much wider 

 distally than proximal end of dacty- 

 lus. Dactylus of first two legs longer, 

 slenderer, and straighter than that of 

 last two. 



Description of female. — Carapace 

 and legs covered with a short pubes- 

 cence. Carapace nearly twice as wide 

 as long, smooth, and rounding down 

 to margins; a shallow depression be- 

 hind gastric region; cardiac region 

 swollen but not ridged. A transverse 

 depression just behind margin of 

 front; antero-lateral margin marked 

 by a granulated line on the branchial 

 region. 



Hand oblong, compressed, margins convex, the lower one concave 

 near the thumb. Fingers little over half length of palm, toothless: 

 thumb wide, but abruptly narrowed near hooked tip; dactyl curved, 

 subuncinate at apex, no longer than thumb. (Chela after Holmes.) 



Fio. 85. — Pinnixa tomextosa, odteb 



MAXILLIPED OF FEMALE (29948), 



X 15J. 



