132 PROCEEDINGS OF THE ACADEMY OP 



form lines, as is also the external surface. The superior and 

 external surface of the carpus is obscurely tuberculose, and the 

 inner surface is crossed by an oblique, smooth ridge. The basal 

 portion of the propodus is shorter than the digital. The superior 

 and external surface is covered thickly with small depressed tuber- 

 cles. On the superior surface these tubercles are distinct and are 

 separated by distinct intervals, but they become gradually smaller, 

 more numerous, and are thickly crowded together towards the in- 

 ferior border. A raised tuberculose margin extends from the 

 base of the propodal finger along the whole length of the inferior 

 border to the carpus. The inferior part of the inner surface is 

 minutely granulose, and is crossed by an oblique tuberculose ridge 

 which extends to the evacuation for the reception of the carpus. 

 The space between this ridge and the base of the dactylus is 

 covered with tubercles. The superior edge is carinated ; from its 

 posterior part a tuberculate line curves downward around the 

 upper part of the depression into which the carpus folds. The 

 fingers are long and slender, smooth and punctate. The row of 

 tubercles along the inner margin of the prehensile edge of the 

 propodal finger curves upward behind the base of the dactylus. 

 The prehensile edge is armed with tubercles ; there is a large one 

 near the middle and another at the tip. The dactylus is tubercu- 

 lose at its base ; its prehensile edge is also armed with tubercles ; 

 those in the median line are the largest. The tips arc hooked. 

 In the ambulatory feet the merus is broad and compressed, and 

 the upper part of the superior surface is marked by pectin iform 

 lines; the fourth and fifth segments are hairy. 



The abdomen is similar to that of G. pugnax. The second and 

 third segments are broadest. The terminal segment is narrower 

 than the penultimate, and is arcuate in form. 



The female is distinguished from the male by being minutely 

 granulose on the dorsal surface of the carapax, and the carapax 

 is nearly plane transversely. 



Dimensions of the male. Length of the carapax .5G-.65 in.; 

 breadth .37 .44 in. Length of the hand .74-1 inch. Length of 

 the carapax of the female .50-.53 in. ; breadth .31 -8*7 in. 



This species can be distinguished from G.jmgnax by having the 

 anterior surface of the merus smooth, and a smooth oblique ridge 

 on the inner surface of the carpus. It differs from G. mordax in 

 not having the superior surface and the upper part of the external 



