S. I. Stnith on American Crustacea. 119 



distal extremity. The superior surface of the carpus is flattened and 

 granulous. The outer surface of tlie basal portion of the propodus 

 is thickly verrucose, the verrucae near tlie upper margin being coarse 

 and tuberculiform, the inner surface is armed only with the oblique 

 tubercular crest running from the inferior marsjin. Both fingers are 

 smooth on the inside, compressed and short, being but little longer 

 than the basal portion of the pi-opodus ; their prehensile edges ai'e 

 evenly tubercular, each armed with a tooth a little way from the tip, 

 and nearly straight, but widely separated at base, leaving a broad, 

 open space within the teeth, but beyond the teeth, the edges meet 

 and the tips hook by each other. The outer surface of the propodal 

 finger is granulous or minutely verrucose and the inferior edge is 

 minutely tuberculated and has a submarginal crest on the outer side. 

 The outer surface of the dectylus is granulous like the other finger 

 and the superior edge is somewhat tuberculated or denticulate. 



The smaller cheliped and the ambulatory legs are very much as in 

 G. heterophthalmus. 



The abdomen is quite similar to that of G. heterojyhthdlmus, but is 

 more narrowed toward the tip and the edges are slightly concave. 



Length of carapax, ..... 



Breadth of " 



Ratio of length to breadtli, . . . . l 



Length of larger hand, ..... 



Length of ocular peduncle on side of smaller cheliped, 

 Length of ocular peduncle on wde of larger cheliped, excluding 

 stylet, ....... 



Length of terminal st3'let of ocular peduncle, 



I have seen but two specimens, both obtained, with the other spe- 

 cies mentioned, by Mr. McNiel, at the Gulf of Fonseca (Collection 

 Peabody Academy of Science). 



In the lengtli of the ocular stylet this species agrees with the G. 

 styllferus, but the merus and hand in the larger cheliped are very 

 different, and at once distinguish it from that species. 



The Gelasimus vocans of Desmarest (Considerations generales sur 

 la Class des Crustaces, p. 123) seems to be distinct from any of the 

 species descibed by recent authors and apparently belongs in this 

 section, as it is distinctly stated that the ocular peduncles are ter- 

 minated by stylets. Edwards refers it to his G. jxihtstris, to which it 

 evidently cannot belong, but, as the character of the front is not 

 stated, it may possibly belong in section B, forming in that case a sub- 

 section with ocular stylets. 



