102 Notes on North American Crustacea, 



margin long and convex. The two antero-lateral margins together 

 would form a regular arc were it not for the projection of the ros- 

 trum. The postei-o-lateral mai'gin is concave, and the posterior 

 margin short and slightly convex. The antero-lateral margin is armed 

 with eleven tridenticulate teeth, little projecting; the middle ones 

 broadest. Protviberances of carapax like those of S. typicus, but 

 stronger; their ridges crenulated. Gasti'ic and cardiac protuberances 

 very tall, with strongly jirojecting apices, which are almost spiniform 

 but not acuminate. Ridge of branchial region convex forward, and 

 crenulated, with a larger toothlet at the middle. Basal joint of the ex- 

 ternal antennge shorter than the next j oint. Eyes very small . Afferent 

 and subhepatic channels very deep ; the ridge separating them being 

 ])rominent and very thin and sharj). No supplementary ridge on the 

 subhepatic region. External maxillipeds with hairy margins, and 

 with a tubercle near the inner summit of the ischium; antero-exterior 

 angle of the meros less acute and prominent than in S. typicus j meros 

 with three or four strong tubercles on the external oblique ridge. 

 Sternum between the chelipeds concave, witliovit tubercles. Chelipeds 

 rather short ; meros seven-toothed before and behind ; carpus with 

 five denticulated crests ; hand with nine strong, subspiniform teeth on 

 the superior crest, and the same number of tuberculiform teeth on the 

 outer and the inner edge of the lower surface; on the inner edge the 

 teeth are minute toward the base, but are large on the outer half of 

 the hand. The surface of the hand between the toothed crests is 

 smooth ; the inferior surface, and tlie intei'stices of the teeth of all 

 three of the crests, are pubescent. The hand is exj^anded in width 

 at the distal extremity, and the dactylus when retracted is exactly at 

 right angles with the palm. Ambulatory feet compressed, glabroiis ; 

 meros-joints with acute, sparsely ciliated superior edge; meros of the 

 posterior pair obtuse below, without crest. Abdomen smooth. 



Length of carapax in a female specimen, 0.40 ; breadth, 0.52 ; 

 length of meros-joint of cheliped, 0.31; length of hand, 0.37 inch. 



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



Heterocryptaj nov. gen. 

 The type of this genus is the Crypto]jodia gramdata of 

 Gibbes, which approaches Solenolamhrits in its characters, and 



