THE GRAPSOID CRABS OF AMERICA. 



169 



PINNIXA BREVIPOLLEX Rathbnn. 



Pinnixa brevipollex Rathbtjn, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 605, 

 pi. 43, fig. 6 (type-locality, ofe Gulf of San Matias, Argentina, 43 

 fathoms, station 2768, Albatross; female holotype. Cat. No. 21593, 



U.S.N.M.). 



Diagnosis. — Lower margin of palm nearly straight; pollex short; 

 dactyl transverse. A transverse, blunt^ cardiac crest. 



Description. — Entire surface covered with a dense pubescent coat. 

 Carapace uneven, punctate; gastric and hepatic regions bounded by 

 very deep furrows ; cardiac region high and crossed by a transverse 

 crest, surmounted in male by two triangular tubercles compressed 

 from before backward, subacute; in female, crest lower, blunt, di- 

 vided in middle by a very shallow sinus. Frontal and hepatic re- 



FiG. 107. — Pinnixa brevipollex, female holottpe, X 21. 



gions granulated. Subhepatic region with a small depressed area 

 or tubercle surrounded by a deep groove. Antero-lateral margin of 

 branchial region armed with from 4 to 6 distant, blunt spinules be- 

 ginning at the lateral angle and followed near hepatic region by 

 smaller tubercles or granules. Inferior margin of carapace granu- 

 lated. Margins of frontal lobes extend obliquely backward from 

 middle. Antennae exceed width of front. 



Last two joints of palpus of maxilliped oblong; terminal joint 

 articulated near base of second joint, and overreaching it consider- 

 ably, overlapping the sternum and in the male touching the tip of the 

 abdomen. 



Chelipeds of male unknown. Propodus of female very broad, flat, 

 increasing in width distally, its greatest width equaling the superior 

 length ; upper margin slightly convex ; lower also for proximal two- 

 thirds ; deflexed for its distal third ; a very short high pollex with a 

 small terminal spine, its distal margin transverse, armed with two 

 tubercles, one near insertion of dactylus and the other at the middle. 



