126 BULLETIN 166, UNITED STATES NATIONAI. MUSEUM 



Diagnosis. — Carapace octagonal. Cardiac region deeply separated 

 from branchial and intestinal regions. A strong pterygostomian 

 tooth. 



Description. — Body and feet everywhere tuberculate or granulate 

 above and below. Carapace convex, subrhomboidal, anterior and 

 posterior angles truncate, lateral angles obtuse. A tooth on postero- 

 lateral margin, separated by a deep sinus from the intestinal region 

 which is bilobate. The anterolateral margin of the hepatic region is 

 sinuous; the region is posteriorly defined by an impressed line; the 

 pterygostomian region has a downward-pointing tooth, hardly visible 

 in dorsal view. Cardiac and inner lobules of branchial region strongly 

 protuberant. Front elevated and connected with the middle protu- 

 berances by a narrow longitudinal ridge traversing the gastric region. 

 On either side of this ridge there is a deep and rather broad excavation 

 of a darker color than the protuberant parts, which extends laterally 

 over the anterior part of the branchial region but is nearly divided 

 in two by the slightly prominent hepatic region, which projects 

 inward from the anterolateral margin, with an arcuated inner edge 

 armed with prominent granules. A similar deep and ver}'' narrow 

 sulcus separates the cardiac from the branchial regions, and passes 

 behind the former, separating it from the thick intestinal lobes. A 

 slight shallow depression on the branchial region along the postero- 

 lateral margin. On the protuberant middle and posterior parts of the 

 carapace the granules are very large and somewhat irregularly piled 

 upon one another, leaving upon the cardiac numerous small eroded 

 cavities. Front strongly prominent, with a concave margin fissured 

 at middle. 



Merus of cheliped broader than hand, outer margin convex and a 

 little irregular; hands rather small, uniformly granulated above and 

 below and tapering to rather slender fingers. Legs cylindrical, covered 

 with small granules, which on the dactyls become minute, crowded, 

 and almost spinuliform. Sternum and abdomen covered with small, 

 hard smooth tubercles. Abdomen armed with a backward-pointing 

 tooth at proximal end of penult segment. (After Stimpson.) 



Color. — A light gray or buff; female occasionally with two or three 

 small red spots on abdomen (Hay). Pale red (von Martens). Sternum 

 and abdomen ornamented with seven or eight red dots (Stunpson). 



Measurements. — Male (51382), length 11.8, width 12.4; female 

 (51382), length 13.3, width 14.5 mm. 



Habit. — Not uncommon at depths from 1 to 5 fathoms in the 

 channels about Beaufort. When brought to the surface in the dredge 

 it feigns death and is only with diflSculty distinguished from the 

 pebbles and bits of shell among which it appears to make its home. 

 Eggs occur at intervals throughout the summer. (Hay.) 



Range. — North Carolina to Brazil; below low tide to 25 fathoms. 



Material examined. — See table 39, page 130. 



