238 Bulletin Vanderbilt Marine Museum, Vol. VII 



lateral margins, which are 1.5 times as long as the anterolateral 

 margins, are sharply delineated, granulose, posteriorly conver- 

 gent. The posterior margin is 75 millimeters long, carinate. The 

 sidewalls of the carapace are high, smooth, the pterygostomian 

 channel deep. The areolae of the carapace are distinctly defined, 

 the sulci shallow, but definite, except the urogastric pits, which 

 are deep. The mesogastric, epibranchial and mesobranchial areas 

 are moderately convex and are paved with numerous large, flat- 

 tish, rounded granules interspersed with coarse punctae. Similar 

 granulose patches are conspicuous on the upper half of the carpus 

 and palm of the chelipeds. 



The antennular fossett is separated medially by the epistome 

 process. The basal antennular article is much enlarged, triangu- 

 lar, with this outer angle and lateral margin distally produced, 

 partially closing the orbital sinus. The second antennal article 

 is rectangular and is situated between the basal antennular article 

 and the orbital tooth. 



The external maxillipeds are close-fitting, with the ischial 

 articles of the endognath very setose along the inner lateral 

 margins ; the merus is distally truncate with the angles not pro- 

 duced. 



The male belt is seven-segmented, triangular, moderately 

 wide. TTie female belt is widely oval, composed of seven somites. 



The female carapace has the third spine of the anterolateral 

 margin entirely obsolete on the left side, but on the right side 

 this spine is more distinctly developed than are either of those 

 on the male specimen. 



The chelipeds are slightly unequal in the male, the right one 

 being the larger in the present specimen, the difference being 

 chiefly apparent in the more massive palm. The merus is strong, 

 trigonal, with both the upper lateral margins carinate and the 

 posterior lateral margin with a subdistal node ; the inferior mar- 

 gin ends in a coarse, blunt, protruberant node. The carpus is 

 convex with a very strong, acute tooth at the inner lateral angle, 

 and the upper surface coarsely granulose, as are also the pro- 

 podus and proximal portion of the finger. The palm is as high 

 at the base of finger as the upper margin is long, with the upper 

 and outer surfaces convex and a faint sulcus on the upper half 

 of the outer surface and two vague submedian costae, the lower 

 of which is much more definite and granulose, terminating near 



