Notes on North American Crustacea. 195 



valida, ei Oncinopi simili. Dactyli pedum ambulatoriorum primi paris 

 gracillimi, uncinati ; reliqui falciformes. Feminae sternum concavura, 

 profundura, marginibus elevatis, larainato-dilatatis, — capsulam eflBciens ; 

 abdominis segmentum primum sat grandis ; secundum, tertium quar- 

 turaque brevissima ; quintum, sextum, septimumque coalita. 



This genus is allied to Acha'us, but the rostrum is entire, and 

 the first two pairs of ambulatory feet are sub-prehensile. It 

 appears to be peculiar to the West Indies, as four species are 

 known, all of which are found only in that province. 



Podocliela grossipes, nov. sp. 



PI. II. fig. 5. 



Body everywhere short-pubescent ; feet setose. Rostrum acute, regu- 

 larly triangular, very little longer than broad at base, setose. Meros- 

 joint of the external maxillipeds oblong, much narrower than the ischium, 

 ■with the apices obtusely rounded, inner one very slightly incised, inci- 

 sion broad and shallow. Chelipeds with the hand much inflated ; fin- 

 gers much shorter than the palm, slender, gaping, and annulated with 

 crimson near their tips. First pair of ambulatory feet very robust, with 

 a single series of very short small tufts of curled hair along the upper 

 side ; penult joint very thick, and armed on the inferior edge with a 

 distinct tooth or thumb-process, against Avhich the extremity of the 

 dactylus closes. The rest of the feet become progressively shorter and 

 more slender posteriorly, and have much shorter hands. In the penult 

 and the last pair, the penult joint is scarce longer than the dactylus, 

 much curved, and concave within, with the thumb-process at the base ; — 

 the dactylus is almost always closed against this process, and can be 

 opened only to a limited extent ; so that the last two joints are trans- 

 formed into a strongly subcheliforra or ancoral hand, which projects at 

 a right angle from the preceding joint, and resembles, in every respect, 

 that of the posterior feet of Oncinopus. 



This description is drawn up from a male specimen in which the length 

 of the carapax is 0.56 ; its posterior breadth 0.41 ; length of first ambu- 

 latory feet, 1.39 ; of posterior pair of feet, excluding dactylus, 0.68 inch. 



