n6 Notes on North American Crustacea^ 



granulated. The protuberances of the carapax are smaller than usual, 

 but prominent, and covered with tubercles, or granules, much larger 

 than those on the depressed parts. The branchial protuberance is 

 divided into two, one part being connected by a ridge with the ante- 

 rior lateral tooth, and the other by a thicker ridge with the posterior 

 lateral tooth. There is a median tuberculated ridjie extending from 

 the frontal region to the cardiac, and interrupted at the centre of the 

 carapax. Between the cardiac and the branchial region on either 

 side there is a deep narrow cavity, bridged over by the meeting of a 

 projection from the cardiac region with a similar projection from the 

 posterior branchial protuberance. The hepatic region is not very 

 protuberant above, and bears a short longitudinal ridge. The mar- 

 ginal teeth of the carapax are all prominent, thickened, coarsely 

 granulated, and separated by rather deeply concave intervals. The 

 anterior lateral tooth (that on the branchial region, forming the an- 

 tero-lateral angle of the body) is very large and prominent, and 

 there is a smaller triangular tooth in front of it, pointing downward. 

 Between this latter and the triangular hepatic tooth there is a deep 

 sinus. The subhepatic tooth is very prominent and tuberculated. 

 The posterior lateral tooth is obtusely rounded. The posterior mar- 

 gin is thinner than the anterior and lateral margins on account of the 

 deep excavation around the cardiac region ; the intestinal I'egion is 

 bilobed, but the lobes do not form dentiform projections, the poste- 

 rior outline being nearly straight when viewed from above, though 

 interrupted at the middle. The front has a deep sinus at the middle, 

 and is somewhat bimarginate. The epistome is very short, and the 

 suborbital region less developed than usual. The external maxilli- 

 peds are granulated, with the meros of the endognath much smoother 

 than the other joints. The chelipeds are somewhat flattened, and 

 resemble those of the type, X. Cumin gii ^' the outer crest of the hand 

 is rather sharp. The ambulatory feet are granulated and tubercu- 

 lated ; the tubercles not spiniform. The abdomen is densely tuber- 

 culated. 



Dimensions of the female specimen : Length of carapax, 39 ; 

 breadth, 0*48 inch. 



This can scarcely be the Ehalia mammUlosa of Desbonne and 



