114 Bulletin, Vanderhilt Marine Museum, Vol. II 



there is one large, triangulate, upward-pointing spine above the eye, 

 in addition to the larger triangulate postorbital spine which is directed 

 outward and forward; there are four similar obliquely outward and 

 forward-directed anterolateral spines, one hepatic and three branchial, 

 the first, second and third of these spines each has inside it near the 

 base a shorter, strong, conical spine; there is one strong, upcurved, 

 postlateral spine which is placed much higher upon the carapace than 

 are the lateral spines ; there are also two or three small spines on the 

 postlateral line. In addition to the numerous small spines on the 

 dorsal surface there are in the median line on the gastric region three 

 larger, conical up-pointing spines and behind the third of these a 

 pair of similar, submedian spines, followed by one large median spine 

 on the genital region, one on the cardiac followed by a submedian pair 

 of slightly smaller spines which in turn are followed by one small 

 median spine on the intestinal region. In a line running in obliquely 

 from the high postlateral spine are two, sharp, conical spines on the 

 branchial region which are smaller than the postlateral spines but 

 distinctly larger than the very numerous little spines of the carapace. 

 The pterygostomian region is very spinose and there is a broken line 

 of spinules on the lateral walls below the large spines. 



The free joints of the antennal peduncle are set in the orbital sinus 

 and are small ; the tapering, whip-like antennae is twice as long as the 

 rostral horn. 



The antenuulae are prominent and fold obliquely within the fossett. 

 sett. The median projection from the roof of the rostrum, semi- 

 separating the fossett into two chambers, is produced into a very 

 strong spine curved down and then forward. 



The eyestalk is very small, slightly curved basally, tapering dis- 

 tally; the cornea is elliptical, terminal, placed obliquely at the end 

 of the stalk. 



There is practically no difference in size between the chelipeds of 

 the male and female. The chelipeds are slender, the ischial joint bul- 

 bous and produced obliquely to a strong point at the inner distal 

 margin, reinforcing the short, subcylindrical merus, which is spinous 

 on the upper surface, as is also the carpus, which is almost as long 

 as the merus; the hand is smooth, laterally compressed, slightly con- 

 vex; the fingers are two-thirds as long as the hand, slender, curved, 

 tapering, with a buttonhole-like gape proximally, the distal two-thirds 

 of the edges meeting upon each other. 



