S. I. Smith on American Crustacea. 175 



carapax, the minute eyes, the peculiar, Ostracotheres-like, external 

 maxillipeds, the broad male sternum with the verges arising from it, 

 and the narrow male abdomen, show close affinity with the Pinnothe- 

 ridfe but the union of so many segments of the male abdomen sepa- 

 rates it again from that family. 



. EXPLANATION OF PLATES. 



Plate II. 

 All the figures are natural size, except 2, 11, and 11* and all are copied from photo- 

 graphs, except 6* . 



Figure 1. — Gelasirrms pugnax. Carapax of a male, from New Haven. 



Figure 2. — G. rapax. Anterior portion of the carapax of the male, seen partly iu a 

 front view and enlarged two diameters, r 



Figure 3. — G. mordax. Carapax of a male, from Para. 



Figure 4. — G. minax. Carapax of a male, from New Haven. 



Figure 5. — G. armatus. Carapax of the male, from the Gulf of Fonseca. 



Figure 6 — G. heterophthalmus. 6, carapax of a male, from the Gulf of Fonseca. 6**, 

 terminal portion of the ocular peduncle, on the side of the larger cheliped, with its 

 stylet, seen in a front view. 



Figure 7. — G. heteropleurus. Carapax of a male, from the Gulf of Fonseca. 



Figure 8. — G. princeps. Carapax of a female, from Corlnto. 



Figure 9. — G. ornaius. 9, carapax of the female. %^ , facial region of the same 

 specimen. 



Figure 10. — G. princeps. Carapax of a male, from Corinto. 



Figure 11. — G. gihhosus. 11, carapax of the male, enlarged two diameters. 11**, out- 

 line of the front of the same specimen, enlarged two diameters. 



Plate III. 



All the figures are natural size, and all from photographs, except 4^ , 5, and b^ . 



Figure 1. — Gelasimus heterophthalmus. 1, outer surface of the hand of the larger cheli- 

 ped. \^ , inner surface of the hand of another specimen. 1^ , anterior surface of 

 the merus of the same cheliped as figure 1 . 



Figure 2. — G. heteropleurus. 2, outer -surface of the hand of the larger cheliped. 2^, 

 inner surface of the hand of another specimen. 2^ , anterior surface of the merus 

 of same cheliped as figure 2=^ . 



Figure 3. — G. princeps. 3, outer surface of the hand of the larger cheliped. 3* , ba- 

 sal portion of the inner surface of the hand of another specimen. 3^ , anterior sur- 

 face of the merus of the same cheliped as figure 3» . S^j, external maxilliped. 



Figure 4. — G. armatus. 4, outer surface of the hand of the larger cheliped. 4" , 

 anterior surface of the merus of the same cheliped. 4*5 , 4c , 4<i , ambulatory legs 

 of the posterior, of the third, and of the second pair in the same specimen. 



Figure 5. — G. ornatus. 5, outer surface of the hand of the female. 5* , 6^ , 5^ , ambu- 

 latory legs of the posterior, of the third, and of the second pair in the same specimen. 



