278 



NATURAL HISTORY BULLETIN. 



are very similar to those of H. spinulosum. Surface partially 

 granulate. The ischium at its distal extremity is wider than 

 the merus; its antero-lateral angle is produced. The merus 

 is narrow at base, its outer margin is arcuate, antero-internal 

 margin oblique; inner angle spinulous. 



The chelipeds are very unequal, the right the larger; 

 surface finely granulate. Merus very thick, trigonal, spinu- 

 lous on upper and outer margins and toward distal end. Car- 

 pus with outer surface tuberculous, inner margin thick, armed 

 with sharp spinules; inner angle prominent, quadrate. Manus 

 very deep distally; upper surface spinulous and tuberculous; 

 pollex short, triangular, edged with eight small rounded teeth. 

 Dactylus wide, upper margin arcuate, spinulous; inner edge 

 with five crenate teeth larger than those on the pollex. The 

 fingers are gaping and resemble the beak of a parrot. The 

 smaller cheliped is very spinulous, the upper margin spinous, 

 the fingers proportionally longer and more slender, gaping 

 slightly at base. Ambulatory legs with merus joints spinous 

 on upper margin and in last pair spinulous on outer surface. 

 Carpal joints spinulous in first three pairs. Dactyli very long 

 and slender. The ambulatory legs art; fringed with long silky 

 hair, also the upper margin of smaller cheliped, the lower 

 margin of the carapace, the margins of abdomen, sternum and 

 maxillipeds. 



Dimensions. — Length 42.5, width 36.5, length of cheliped 

 72, greatest depth of manus 22, length of lower margin of 

 manus 36, length of smaller cheliped 37.5, length of dactylus 

 of first ambulatory leg on left side 14.5, same on right side 

 15.7 mm. 



Type locality. — Off Cozumel, Yucatan, 231 fathoms, station 

 2359, steamer "Albatross," one male (U. S. Nat. Mus. No. 

 9558). 

 Trachycarcinus spinulifer sp. nov. PL vi, Fig. 1. 



Protuberances of the carapace small and spinulous; chelipeds 

 subequal; outer surface of hands rough. 



Shape of the carapace much as in T. corallinus; antero- 

 lateral margins more convex. Surface covered with a light- 



