242 Bulletin Vanderbilt Marine Museum, Vol. VII 



meters deep, approximately rectangular, with the two long mar- 

 gins faintly sinuate, the upper margin beaded, faintly quadrilo- 

 bate, the lower margin laminate, faintly bilobed, the angles nearly 

 right angles faintly rounded ; the surface of this frontal area is 

 concave in both directions. The superior orbital margin is entire 

 with the postorbital angle a sharp, triangular tooth behind 

 which there are two successively weaker teeth on the lateral mar- 

 gin, which itself forms a thin carina throughout the entire length 

 and is posteriorly confluent with a similarly carinate posterior 

 margin. This second lateral tooth is sometimes quite rudiment- 

 ary. The anterior half of the carapace is ornamented with fre- 

 quent coarse flattish irregular tubercles, these becoming smaller 

 posteriorly and being replaced on the lateral area by oblique 

 striations. The pterygostomian region is covered by a reticula- 

 tion of regularly spaced fine tubercles, semiconcealed beneath the 

 coarse, regularly spaced pilosity. The male abdominal belt is 

 seven-segmented, triangular. 



The male chelipeds are equal, large, the merus being trihedral, 

 with the three margins coarsely granulose or dentate, with an 

 enlarged, subdistal tooth on each lower margin; the carpus is 

 convex and granulose on the outer face, with the inner margins 

 coarsely beaded or spinose and a strong, slender spine at the 

 inner angle; the propodus is enlarged, with its length on the 

 lower margin equal to three-fifths of the greatest width of the 

 carapace; the height of the palm is equal to five-sixths of the 

 length of the lower margin of the palm ; the lower finger being 

 three-fifths as long as this lower margin and continued in the 

 same plane, but incurved distally. Both the inner and outer sur- 

 faces of the palm are quite convex and are covered with numerous 

 coarse, usually round or sometimes sharp granules, spaced irreg- 

 ularly and not so close together; these granules form a distinct 

 beading along the upper margin and are continued on the upper 

 and lower proximal areas of the two fingers, also distally in a 

 linear series. The lower finger is the shorter, triangular, in- 

 curved distally, separated from the upper one by an oblique 

 hiatus, which is oval proximally, nearly linear distally. The inner 

 base of the lower finger is furnished with numerous tufts of 

 bristles, filling in this hiatus ; the remainder of the cutting edge 

 bears eight to ten teeth, the third from proximal of which is 

 much the larger ; the apices of the fingers are rounded, spatulate. 



