160 BULLETIN OF THE 



The excavations between the regions are very deep, but those surround- 

 ing the cardiac region are broader and less abrupt than in other species 

 of the genus ; those surrounding the hepatic region and lying in front of 

 the branclilal are very narrow. In one of the two specimens there are 

 several small, round, isolated tubercles in the depression between the 

 cardiac and gastric regions ; while in the other this space, as well as the 

 entire gastric and part of the branchial region, is evenly covered with flat, 

 translucent granules, giving the surface a finely reticulated appearance. 

 The hepatic region is narrow, with a granulated ridge extending inward a 

 short distance from the antero-lateral margin, which is here defined by a 

 similar ridge. Behind the hepatic region, and separated from it by a deep 

 transverse sinus below, there are on the margin two strong, triangular 

 teeth pointing downward on the antero-lateral part of the branchial region. 

 The posterior of these two teeth corresponds to the anterior lateral tooth 

 of other species of the genus, but the tooth in front of it is the larger ; the 

 surface of both is flattened. The posterior lateral tooth of the branchial 

 region is blunt. The intestinal region is broad, and the two marginal 

 lobes, are thickened, but very little projecting, and not at all dentiform. 

 On the inferior surface of the branchial region there are one or two rows 

 of small tubercles. The front is thick, the epistome and suborbital region 

 ample, and the external maxillipeds bent nearly to a right angle in front, 

 so thai the anterior portion of the facial region is large and lies in a verti- 

 cal plane. The frontal margin is slightly concave, but not notched. The 

 chelipeda are rugose, with angular, granulated protuberances; meros not 

 at all flattened, but nearly as thick as it is broad. Ambulatory feet armed 

 above with short, thick spines, as in L. Cumingii; dactyli and penult 

 joints somewhat setose. Color, bluish-white, with flake-white ridges and 

 tubercles ; frontal portion and feet, flesh-colored ; a few blood-red spots on 

 the abdomen and about the bases of the feet, particularly of the chelipeds. 

 Dimensions of the larger female: Length of carapax, 0.26; breadth, 

 0.30 inch. 



- This crab is well protected by its general appearance, and with its feet 

 retracted would scarcely be taken for a living object. It differs from L. 

 cariosa in its broader and more convex carapax, and in the much less 

 prominent lobes of the intestinal region. 



West of Tortugas, January 16, 1869. Cast No. 7. 35 fathoms. 

 Off Conch Reef, March 21, 1869. Cast No. I. 40 " 



Academy of Sciences, Chicago, III., 

 December 1st, 1870. 





