44 Description of Two New Species of Grapsoid, t&c. 



carapace has nearly the same arrangement of its areolar areas 

 as that in Uca una (Lat.), but they appear to be less distinctly 

 defined. 



The postorbital angle is convex 



The jugal region is granulated ; the suborbital area trans- 

 versely semicordate and nearly smooth ; the suborbital margin 

 is strongly crenulated. 



The abdomen of the male has the sides slightly emarginate 

 at the middle, and with the first segments laterally di- 

 lated ; the last segment is semicircular ; the penultimate 

 quadrate, slightly transverse and not much longer than the 

 fifth. 



The cheliped has its meros studded with a crest of conical 

 denticulations on its internal and inferior angles, and crenulated 

 folds on its external ; the corpus is externally convex, and has on its 

 internal margin two approximated carinas, the internal of which 

 is studded with conical protuberances, and the external more or 

 less crenulated ; the hand is above crested by a row of conical 

 teeth ; below there are several very finely crenulated lines 

 which are most distinct anteriorly. 



The feet have scattered hairs on the inferior angles of their 

 meros and the corpus and manus are densely covered beneath 

 by similar hairs ; the two last pair are comparatively naked. 

 The feet of the third pair are longest. 



Length of carapace 1*01 inch ; width 1'30 inch. 



The upper surfaces of the feet and chelipeds are of a beauti- 

 ful pale sanguineous color, 



Asiugle specimen was present in a collection of the crustaceans 

 of the island of St. Thomas, made by Mr. A. H. Riise. It differs 

 especially from the Uca una of Latreille in the armature of the 

 chelipeds, and by the dense hairs of the inferior angles of the 

 feet. 



