112 Wotes on North American Crustacea^ 



perfect, tlie hands being wanting. It has somewhat the aspect 

 of a Callinectes. 



It was taken at Manzanillo, Mex., by John Xantus, Esq. 



Achelous acuiniiiatu§, nov. sp. 



Body and feet pubescent. Cai-apax very short and broad ; propor- 

 tion of length to breadth, 1:2.52 ; surface uneven, but with the pro- 

 tuberances few in number and large, these being on the gastric, 

 cardiac, and inner branchial regions. All the protuberances and 

 ridges are graniilated at their summits only. The branchial ridge is 

 convex, bending rather abruptly forward near the base of the lateral 

 s{)ine. This lateral spine is very long, nearly two-thirds as long as 

 the antero-lateral margin. The other teeth are rather sti'ong, the 

 second, fourth, and sixth being somewhat smaller than the others. 

 Front convex, separated from the orbit by deep incisions ; median 

 teeth projecting somewhat beyond the level of the outer angles of 

 the orbit ; teeth equal, bluntly triangular, moderately deeply cut ; 

 median teeth most projecting. A large notch on the margin of the 

 orbit above the insertion of the external antennae. Chelipeds very 

 long, nearly three times as long as the carapax ; meros longer than 

 the carapax, projecting nearly to the middle of the penult joint of the 

 first pair of ambulatory feet, and tapering, and armed with four spines 

 in front ; carpus slender, inner spine no longer than the basal spine 

 of the hand ; hand very slender, almost sword-shaped, and with 

 strong granulated ridges. A spine on the meros-joint of the pos- 

 terior pair of feet. 



Dimensions of a male: Length of carajmx, 0.50; breadth, 1.26 

 inch. 



Found at Panama by Capt. J. M. Dow. 



Acheloiis |)aiianieii!«is, nov. sp. 



Carapax moderately broad ; regions moderately protviberaut. 

 Branchial ridge bending very abruptly forward near the base of the 

 lateral spine. Lateral spine as long as the space occupied by the 

 three teeth in front of it. The other lateral teeth are rather strong, 

 and of equal size. Front projecting slightly beyond the level of the 



