356 SYNOPTIC COLLECTION. 



Eriphia gonagra M. Edw. (No. 870), has the outer side 

 of its arms and the forward part of the cephalothorax 

 thickly studded with knobs, while the inner and ventral 

 portions of the arms are smooth. The eyes in this genus 

 are wide apart and the front of the cephalothorax is 

 broad, while the region as a whole is quadrilateral. No. 

 870 b, c, represent the male "and female. The most 

 marked difference between the two is in the abdomen, 

 that of the male (b) being small and narrow, while that 

 of the female (c) is broad and fringed with hairs for the 

 purpose of carrying the eggs. 



Calappa granulata Fabr. (No. 871), has a convex tri- 

 angular carapace with its greatest breadth at the pos- 

 terior part. It is light in color with a luster as if polished. 

 The abdomen is very narrow and in a dorsal view wholly 

 concealed by the cephalothorax and carapace which also 

 cover the largest sections of the legs. The claws are 

 unique organs ; they are flattened vertically and the im- 

 movable section of the claw rises higher even than the 

 cephalothorax. 



Corystes dentatus Fabr. (No. 872), is one of those crabs 

 that have a cephalothorax longer than broad. It is 

 found, according to Bell, 1 in rather deep water and has 

 the habit of burying itself in the sand with the exception 

 of the tips of the antennae. It is evident that a long, 

 pointed, more or less tubular cephalothorax is more con- 

 venient for a burrowing animal than one that is broad, 

 flat, and truncated at the forward end. The body is light 

 colored, and the long, slender arms extend forward rather 

 than sideways. 



Cardiosoma guanhumi Latr. (No. 873), has a hard, 

 tough, dark brown shell covering a body of unusual 

 thickness, and also its prodigious right arm which in the 

 male is out of all proportion to the rest of the appendages. 

 The claw is provided with two blunt, knob-like teeth placed 



^rit. Stalk-eyed Crustacea, 1853, p. 161. 



