166 S, J. Smith on American Crustacea. 



edge is slightly crested and the tip is hooted by the tip of the pro- 

 podus. The prehensile edges of both fingers are sharp, very slightly 

 dentate, and do not gape, or only very slightly. 



The ambulatory legs are slender and minutely granulous ; the pro- 

 podi are slightly hairy on the posterior edges ; and the dactyli are 

 slender, slightly compressed, those of the posterior pair considerably 

 shorter than the others, and all clothed with very short hair. 



The sternum is minutely granulous. The terminal segment of the 

 abdomen is about as broad as long, and the extremity is obtusely 

 rounded. The appendages of the first abdominal segment are long, 

 slender, nearly straight, and reach to the terminal segment. The 

 appendages of the second segment are short and very small. 



The females differ from the males in being more convex and in the 

 front being less prominent and very sliglitly deflexed. The young 

 males approach the females in these characters. 



The fingers ai-e black in both sexes. 



The chelipeds of numbers 2, 4, 6, and 9, give the following mea- 

 surements: — 



Collected at Panama by F. H. Bradley. 



Family, Pinnotherid.e. 

 Pinnotheres Latreiiie. 

 Pinnotheres margarita Smith. 



I_ Verrill, American Naturalist, vol. iii, p. 245, July, 1869. 

 This is a stout, thick species, with a firm integument, and every 

 where covered, except the dactylus of the right ambulatory leg of the 



