S. 1. Smith on American Crustacea, 135 



I have seen but a sinole specimen,' which was collected at Aspinwall 

 by F. H. Bradley. Although closely allied to G.minax andpuffnax, 

 it is vei-y different from any specimens which I have seen, of either of 

 those species, and is readily distinguished from them by the very short 

 and stout fingers, the tubercles on the basal portion of the upper mar- 

 gin of the dactylus, the long basal portion of the propodus and the 

 line of bead-like tubercles along its border next the base of the 

 dactylus. The differences in the carapax are however very slight, and 

 it may possibly prove to be a variety of G. pugnax. 



G-elasimus mordax, sp. nov. 



Plate II, figure 3. Plate IV, figure 4, 4\ 



Male. The carapax is convex both transversely and longitudinally 

 The dorsal surface is jmnctate and the space between the puncta is 

 smooth and naked, but the puncta themselves give rise to short hairs 

 which are very easily removed. The front is much less deflexed than in 

 the allied species, its dorsal surface is divided by a distinct median sul- 

 cus and its inferior surface, between the margin and the epistome, is 

 quite high. The upjjer edge of the superior orbital border is directed 

 somewhat backward as in G. rapax, but is straight and not sinuous ; 

 the border itself is much more oblique than in the allied species, so 

 that it appears very large as seen from above. The anterior part of 

 the lateral margin is thin and projects somewhat laterally. 



In the larger cheliped, all the segments are more elongated than in 

 the allied species. The anterior surface of the merus is smooth, nar- 

 row in outline and its margins are tuberculose. The superior and 

 exterior surface of the carpus is obscurely tuberculose, and its inner 

 surface is crossed by an oblique ridge which is nearly smooth. The 

 basal portion of the propodus, as seen in front, is narrowed toward the 

 articulation of the carpus and is very much shorter than the digital 

 portion ; the superior, and the upper part of the exterior, surface is 

 obscurely tuberculose while the lower portion is smooth ; the oblique 

 ridge on the inferior border of the inside, is much higher and extends 

 farther back toward the articulation of the carpus than in the allied 

 species, and is tliickly covered with very large, rounded tubercles, 

 and all the space between its upper portion and the base of the 

 dactylus is covered with depressed tubercles; the superior edge is 

 somewhat carinated, slightly tuberculose and margined on tlie outside, 

 and the inner margin is turned abruptly downward at the extremity 

 of the depression into which the carpus folds ; and finally, between 

 this abruptly curved portion and the base of the dactylus and just 



