STALK-EYED CRUSTACEA 271 



articulation with the next joint, otherwise smooth and 

 rounded ; its upper and lower margins have spiniform 

 teeth which are more prominent above ; fifth joint (carpus) 

 elongate, with indistinct tubercles. Hand very large, com- 

 pressed, externally tuberculate on the basal portion, above 

 with several teeth like those of the fourth joint, inferior 

 margin proximately tuberculate, outer surface of fixed 

 finger with large shallow punctae, the lower portion being 

 marginate. Occludent margin with three rows of tubercles, 

 the middle one forming a prominence at the basal two-fifths, 

 the other rows undulating extremely contorted, acute, inner 

 surface nearly smooth, with a tubercular ridge running 

 from the articulation of the movable finger to the middle 

 of lower margin of the palm ; movable finger lamellate, 

 broader near tip than at base, externally granulate. The 

 abdomen of the male is broadest at the junction of the 

 second and third segments ; in the female the terminal 

 joint of the abdomen is dovetailed into the sixth 

 segment. Front narrow between orbits. 



Range. — British Guiana, Cayenne, West Indies, Brazil, 

 Natal, West Coast of Nicaragua. 



2. Gelasimus heterocheles. 



Gelasinms Jieterocheles 

 Cancer vocans major . 

 Cancer uka .... 

 Ocypoda heterocheles . 

 Gelasinms niaracoani 

 Gelasinms platydacty lit s 



Seba, Kingsley. 



Herbst. 



Shaw. 



Bosc. 



Desmarest. 



Milne Edwards, Saussure. 



Gelasinms princeps . . Smith, Lockington. 



Carapace transversely, nearly flat. Fourth joint of 

 large pincer rounded posteriorly, its lower margin crenu- 

 late, its upper produced into a broad, arcuate, laminiform, 



