N'otes on North American Crustacea. 187 



shallow ; protuberant parts somewhat tuberculated, but not prominently 

 so. Surface minutely granulated, particularly near the margin ; frontal 

 region sparsely hairy. Horns of the rostrum small but rather promi- 

 nent, projecting beyond the praeorbital teeth or angles, and beyond the 

 spine of the basal joint of the antennae. Lateral margin armed with 

 four teeth, besides the angle of the orbit ; teeth minute, acute. Orbits 

 deep ; inner and outer angles prominent. The anterior margin of the 

 very broad basal joint of the antennae is bidentate, the inner tooth 

 minute, the outer somewhat unciform, curving inward at tip. Chelipeds 

 of moderate size ; meros unarmed within ; carpus with three or four 

 minute tubercles ; hand smooth, white, encircled with a broad median 

 ring or band of mahogany-color ; fingers stout, also annulated ; dactylus 

 armed with one tooth within ; no tooth on the pollex or immoveable 

 finger. Feet pilose with capillary setae. Length of carapax in the male, 

 0.63 ; breadth, 0.62 inch. 



Found at the Tortugas by G. Wurdemann, and at St. Thomas 

 by A. H. Kiise. 



Ifliihraculus denticiilatus. 



Mithrax denticulatus Bell, Trans. Zool. Soc. ii. 54, pi. xi. f. 2. 

 Mithraculus denticulatus White, Cat. Brit. Mus, Crust. 1847, p. 7. 



Found at Cape St. Lucas by Mr. Xantus. Bell's specimens 

 •were from the Gallapagos Is. 



initlirax Terrucosus. 



Mithrax verrucosus M. Edwards, Mag. de Zool. 1832, pi. iv. Hist. Nat. 



des Crust, i. 321. 



Horns of the rostrum very short, blunt. Carapax naked, closely 

 covered with flattened granules ; marginal spines blunt, tuberculiform. 

 Basal joint of the external antennae three-spined, spines blunt, tuberculi- 

 form. Notch of the meros-joint of the outer maxillipeds very broad 

 and shallow. Hands smooth above. 



Found at Xey Biscayne by Mr. Wurdemann, and at the 

 Tortugas by Dr. Whitehurst. 



