168 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



PINNIXA AFFINIS Rathbun. 



Pinnixa afflnis RATHBUN, Proc. U. 13. Nat. Mus., vol.' 21, 1898, p. 606, pL 

 43, figs. 7-9 (type-locality, Panama Bay, 26 fathoms; female holotype, 

 Cat. No. 21594, U.S.N.M.). 



Diagnosis. Lower margin of palm of female mostly convex; 

 pollex short; posterior margin of merus of third ambulatory leg 

 armed with spinules or small spines. 



Description. Allied to P. occidentalis. Carapace of female 

 broader than in occidentalis, regions distinctly indicated, cardiac re- 



FIG. 105. PINNIXA APFINIS, FEMALE HOLOTYPE. a, DORSAL VIEW, X 3 ; 6, ENDOGNATH 



OB 1 OUTEK MAXILLIPED, X 221- 



gion crossed by a blunt, transverse, bilobed crest; surface punctate^ 

 punctae largest on branchial regions. Antero-lateral border of bran- 

 chial region a granulate line. Front not advanced beyond line of 

 subhepatic region. Third joint of palp of outer maxilliped articu- 

 lated near proximal end of inner side of second. 



Chelipeds smooth, pubescent ; lower margin of palm convex except 

 near base of pollex, which is short, very broad, deflexed, prehensile 



edge irregularly dentate, terminating in a 

 short, acute spine; dactylus with a large 

 tooth at basal third; fingers not gaping 

 when closed. 



First two legs slender, margins of pro- 

 podal joints subparallel; first reaches to end 

 FIG. 106. PINNIXA AF^INIS, of propodus of second; second to end of 

 RIGHT CHELA OF FEMALE propodus of third. Third leg broadest; 



HOLOTYPE, X 13. T 1 



merus very hairy along margins; posterior 



margin armed with spinules, those near middle larger and spine- 

 like; anterior margin granulous. Fourth leg reaches about to end 

 of carpus of third; propodus narrow, as in first and second. 



Measurements. Female holotype, length of carapace 3.4, width 

 of same 7.3 mm. 



Specimen examined. Panama Bay, lat. 8 27' 00" N. ; long. 79 

 35' 00" W.; 26 fathoms; gn. M.; Mar. 30, 1888; station 2803, Alba- 

 tross; 1 female with eggs, holotype, Cat. No. 21594, U.S.N.M. 



