Notes on North American Crustacea. Y7 



not concealed by sordes ; with scarlet patches on the margins of the 

 median region of the carapax, and on the upper sides of the hands. 



Carapax convex, smooth at the middle, but uneven and rugate 

 towards the sides. Front of gastric region protuberant. Frontal region 

 much depressed. Front tridentate, teeth however but little prominent ; 

 margins tomentose. Chelipeds large, resembling in shape those of 

 Polijomjx macrocheles, but rugose, strongly granulated above and longi- 

 tudinally bi-sulcated, dividing the surface into three equal obtuse ridges; 

 meros very large, not dilated at anterior angle ; carpus longer than 

 broad, with entire margins, front margin not dilated, posterior margin 

 arcuated ; hand short, triangular, much narrowed behind, summit at 

 juncture of finger very prominent ; surface of hand more deeply sul- 

 cated than that of carpus, and outer margin hairy ; fingers gaping, hairy 

 above, crossing each other at tips ; dactylus rather longer than the 

 palm. Length of carapax, 0*29 ; breadth, 0-29 ; length of meros joint 

 of greater cheliped, measured on lower side, 0*15 ; length of carpus, 

 0-22 ; of hand, 0-44, inch. 



Found in considerable numbers at Barbadoes by Mr. Gill, and 

 at St. Thomas by A. H. Riise. 



Porcellana ocellata. 



Porcellana ocellata, Gibbes; loc. cit. 190. 



Specimens of this species are often rather reticulated than 

 ocellated. The hand is very broad, and strongly arcuated in 

 the outer margin. In one of our specimens the carapax 

 measures O'TO inch in length, and the same in breadth. 



Florida Keys ; (Wurdemann.) St. Thomas ; (Riise.) 



