14 S. I. Smith on JBrazllian Crustacea. 



and scattered granules on the anterior portion near the inferior oi-bital 

 region. On each side of the buccal area there is a liigh ridge which 

 is armed with a few small tubercles. 



The external maxillipeds are smooth and naked on the outside, and 

 the inner edge and the palpus thickly clothed with coarse hairs. 



The chelipeds are somewhat unequal and very large. The merns 

 is stout, sharply triangular, both the inferior angles are armed with 

 stout spines and the superior angle is coarsely granulous. The 

 carpus is broad, smooth and evenly rounded on the outside, and spi- 

 nous along the inner edge and on the anterior edge beneath. Tlie 

 hand is broad, compressed, spinous on tlie superior margin and on the 

 inside, the inferior margin granulous, and the outer side smooth; the 

 fingers are high and compressed, their tips strongly incurved, and the 

 inner edges slightly separated in the middle and armed with small 

 irregular teeth except at the tips, which are slightly spoon-shaped 

 with the edges horny, continuous and sharp. 



The ambulatory legs arc smooth and naked above, but all the 

 segments in the first three pairs, except the basal ones, are thickly 

 clothed beneath and on the anterior side with very long coarse hair. 

 Those of the anterior pair are longer than the others, and those of 

 the posterior pair are much shorter than the others and but slightly 

 hairy. The dactyli of the first two pairs are very long and stout, 

 slightly curved downward, their extremities compressed vertically 

 and five-sided with the angles sharp ; those of the third pair are much 

 shorter and curved backward as well as downwai'd ; those of the 

 posterior pair are still shorter, strongly curved backward and six- 

 sided, the superior side being much broader than the others. 



The sternum is narrow, very convex in an antero-posterior direction, 

 and the depression for the lodgement of the abdomen is broad, very 

 deep, and extends quite to the base of the maxillipeds. The male 

 abdomen is broadest at the third segment ; the second segment is very 

 small, and the two segments which precede it are completely coalesced. 

 The appendages of the first segment are triquetral and very stout 

 and extend to the extremity of the penultimate segment. The appen- 

 dages of the second segment are very small, extending scarcely be- 

 yond the third segment. 



Length of carapax, 54'0'""' ; breadth of carapax, 73-4™™; ratio, 

 1 : 1-36. Length of merus in right cheliped, 33-8'"'"; in left cheliped, 

 33-0. Length of right hand, 49-5 ; length of left hand, 49-0. 



One of the specimens in the collection of the Peabody Academy of 

 Science has the chelipeds much more unequal than in the specimen 

 described above but agrees with it in all other characters. 



