in the Museum of the SmithsoJiimi Institution. 110 



hand; dactyli about equal to the penult joint in length. The cheli- 

 peds are wanting in the only specimen I have seen. 



The dimensions of this specimen ai-e: Length of carapax, 0.22; 

 breadth, 0.32 inch. 



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

 Spelaeophorus iiocloi^us, A. M.-Edw. 



Ore<yphorus nodosus Bell, Trans. Lin. Soc. , XXI, 307 ; pi. xxxiii, fig. 8. 

 Spdaeojyhorus nodosxis A. Milne-Edwards, Ann. Soc. Ent. de France, 

 4e Serie, Tome V, p. 149. 



Of tliis species there is one (female) specimen in the Smitli- 

 sonian collection. It agrees well with the figure and descrip- 

 tion of Bell, except that the exognath of tlie onter maxillipeds 

 does not taper, but is blunt, almost truncated at the extremity, 

 and that the ambulatory feet are less spinous. The postero- 

 inferior marginal lobe is concave in outline, 'and granulated 

 below ; and its lateral angles do not form teeth projecting 

 downward, as in Bell's figure of a posterior view of the male 

 carapax. This latter may be a sexual difference. The soldered 

 segments of the female abdomen have a longitudinal sulcus on 

 either side of the median line, and the lateral surfaces are ru- 

 gose and pitted, as if eroded. 



The specimen was taken at Jamaica by the late Prof. C. B. 

 Adams. 



PORCELLAXOIDEA. 

 Petr«Bistlies erlouserus, nov. sp. 



Near P. rupicola. Front nearly horizontal. Epigastric lobes 

 rather sharply prominent, more so than in the allied species. The 

 protogastric and epibranchial lobes are also prominent, and there is a 

 channel between them and the orbital and the antero-lateral margins. 

 Front broad, triangular, much less prominent than in P. rv^ncola. 

 Chelipeds (except at the fingers) granulated ; carpus rather elongated, 

 with a straight and entire anterior margin destitute of a prominent 



