166 



BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



lation of carpus; dactjdus strong, down- 

 curved, granules on upper border, both 

 fingers armed with large, blunt, pre- 

 hensile teeth. The smaller chela is fur- 

 nished with setae, is slenderer than the 

 large one, has proportionally longer fin- 

 gers and is sparsely granulate. Cheli- 

 peds of female approximately equal, 

 resembling smaller one of male. Legs 

 covered with coarse setae, dactyls 

 tipped with a small, acute, horny nail. 

 Third, fourth, and fifth segments of 

 male abdomen partially fused, divisions 

 plainly indicated. 



Color. — Wood brown. Larger che- 

 liped of male, and tubercles of carapace 

 ivory white. 



Measurements. — Male cotype (20618), 

 length of carapace 27.5, width of same 

 30.4, length of left cheliped 48.7, length 

 of right cheliped 23.7 mm. 



Range. — From Acapulco, Mexico, to 

 Galapagos Islands. 546 to 695 fathoms. 



Material examined. — See table, p. 166, 



TRACHYCARCINUS SPINUUFER Rathbun 



Plates 70 and 71 



Trachycarcinus spinulifer Rathbun, Bull. 

 Lab. Nat. Hist. State Univ. Iowa, vol. 

 4, 1898, p. 278, pi. 6, fig. 1, (type-local- 

 ity, off the Delta of the Mississippi, 324 

 fathoms; type, Cat. No. 9639, U.S.N.M.). 



Diagnosis. — Protuberances of cara- 

 pace small, spinulous; chelipeds sub- 

 equal, outer surface of hands rough. 



Description. — Shape much as in T. 

 corallinus, antero-lateral margins more 

 arcuate. Surface covered with a thin, 

 fine, light-colored pubescence. Regions 

 well marked, elevations small and nu- 

 merous, covered with small conical tu- 

 bercles, many spiniform; slender spi- 

 nules scattered on carapace, especially 

 on posterior half and near lateral mar- 

 gins. Lateral spines long and slender, 



