138 S. J. Smith on American Crustacea. 



Male. The dorsal surface of the carapax is minutely granulous, 

 very convex longitudinally and swollen along the branchial regions, 

 which, however, do not project above the middle of the carapax, and 

 the regions are not separated by distinct sulci. The front is evenly 

 rounded and strongly deflexed. The superior border of the orbit is 

 nearly perpendicular, and its posterior, or upper, margin is sinuous, 

 curving forward in a slight prominence in the middle. The antero- 

 lateral angle is obtuse and not at all prominent. The lateral margins 

 converge slightly anteriorly and are only feintly indicated on the 

 posterolateral border. The posterior margin is divided into two 

 broad lobes by a very marked median immargination. The inferior 

 border of the orbit is slightly curved and finely denticulate. 



The external maxillipeds are proportionately smaller than in the 

 allied species, the ischium is only very slightly wider than the merus 

 and its outer margin is nearly straight. Corresponding with the form 

 of the external maxillipeds, the buccal opening is smaller and more 

 rectangular than in the other species. 



In the larger cheliped, the angles of the merus are obtuse and 

 granulous and the anterior surface is slightly convex. The outer sur- 

 face of the carpus is slightly granulous. The basal portion of the 

 propodus is nearly as long as the digital portion ; the inner surface is 

 not armed with a tuberculose ridge along the inferior margin, that 

 portion being rounded and only obscurely tuberculose, but on the 

 border next the base of the dactylus, there are two, sharp, tubercular, 

 parallel ridges, the inner one highest and separated from the other by a 

 deep, narrow groove ; the outer surface is densely covered with small, 

 depressed tubercles which are more uniform in size and more promi- 

 nent than in G. piignax, or G. pugilator / the superior edge is tuber- 

 culose but not distinctly margined on the outside as in G. nimax, 

 pt(g}iax, and pi/gilator ^' the inferior edge is armed with a prominent, 

 tubercular margin on the outside, and the flat, oblique space between 

 the inner and outer margins is smooth and shining, while in G. pugil- 

 ator it is covered with rounded granules. The propodal finger is 

 considerably curved upward, its outer surface is armed, on the basal 

 portion, with a distinct, median ridge, the inferior margin is smooth, 

 and the prehensile edge tubercular and armed with a single, large 

 tooth near the middle. The dactylus is strongly and evenly curved, 

 the superior margin is smooth and the prehensile edge is tubercular 

 and armed with several larger tul)ercles toward the base. The smaller 

 cheliped and the ambulatory legs do not differ notably fi'ora those of 

 the allied sj^ecies. 



