108 Notes on North American Crustacea^ 



Microiiaiiope caribbaea, nov. sp. 



Oarapax somewhat pubescent, with two or three transverse I'aised 

 lines, or slight pubescent ridges, on the gastric and on each branchial 

 region. Frontal and gastric regions nearly smooth. Front rather 

 prominent, nearly horizontal ; mai'gin straight ; median sinus slight. 

 Flagellum of the external antennse as long as the front is broad. 

 Chelipeds obsoletely granulated ; carpus with four or five tubercles 

 above, and a tooth at the inner angle ; hand itnarmed, but with 

 two slight parallel longitudinal ridges on the upper side. Ambula- 

 tory feet smooth, slightly pubescent. 



The dimensions of the carapax in a male sjiecimen are : Length, 

 0.16; breadth, 0.22 inch. 



Found at St. Thomas, by A. H. Riise, Esq. 



Chlorodiaii^ occidentalis nov. sp. 



This species represents on the West Coast the C.floridanus 

 of the Caribbean Sea. Like many other West Coast crabs, it 

 differs from its eastern analogue in its broader and less convex 

 carapax. The antero-lateral teeth are less prominent than in 

 Cjloridamis, the second tooth in particular being broader and 

 much less acute. The median lobes, or teeth of the front, do 

 not project beyond the lateral ones. 



Dimensions of a male specimen : Length of carapax, 0.45 ; 

 breadth, 0.74 inch. 



Found at Panama by Alex, Agassiz, Esq., and at Manzanillo, 

 Mex., by Mr. John Xantus. 



PauopeiiM planissiiiiiis. 



Xantho planissima Stimpson, Notes on N. American Crustacea, p. 77. 



The reception of several specimens of this species of larger 

 size, and more perfect than those first obtained, gives an oppor- 

 tunity for a re-examination of its characters, which leads me to 

 refer it to the genus Panojpeus. 



The body and chelipeds are very much depressed. The chelipeds 

 are very large, and the carpus has a groove on the upper surface, 



