120 Bulletin Vanderbilt Marine Museum, Vol. VI 



as the sixth segment, dorsally smooth, slightly convex from side 

 to side; lateral margins convergent, distal margin shallowly 

 rounded ; dorsal surface with two submedian pairs of articulated 

 spines in longitudinal series ; the proximal pair being about half- 

 way the length of the telson and very close to, yet above, the lat- 

 eral margin ; the second pair of spines are half-v/ay between the 

 first pair and the distal margin. The uropoda have a small pe- 

 duncle ; the ovate, nearly subequal blades extend beyond the telson 

 for almost the distal third of their length. The outer blade has a 

 small, subdistal tooth on the outer lateral margin ; both blades are 

 rounded evenly distally and finely ciliated. 



The eye is large, ovoidal, the proximal third semiconcealed be- 

 neath the close hooding carapace ; the facets are coarse, numerous ; 

 the distal margin of the eye reaches almost as far forward as the 

 distal margin of the first peduncular article of the antennules. 



The antennular peduncle exceeds the length of the rostrum by 

 about the length of the distal article ; the flagella are fleshy, tap- 

 ered, of nearly subequal length, each about one and one-third times 

 as long as the peduncle. 



The antennal peduncle is only as long as the first two articles 

 of the antennular peduncle, but the scaphocerite extends slightly 

 beyond the distal margin of the antennular peduncle. The scapho- 

 cerite is lobate-acuminate, the inner lateral mxargin more convex 

 proximally than the outer, the acuminate tip extending almost as 

 far as the distal margin of the second peduncular article of the an- 

 tennulae ; the outer lateral margin of the scaphocerite terminates 

 in a small, acute, triangulate tooth; the distal margin is evenly, 

 rather broadly convex and ciliate. The antennal flagellum is mod- 

 erately stout proximally, about twice as long as that of the anten- 

 nulae. 



The chelipeds are markedly unequal in both sexes. The male 

 right cheliped is the smaller ; the ischium is small, slender ; the 

 merus with the outer lateral surface nearly oval, narrowed proxi- 

 mally and distally but with the median three-fourths, about two- 

 fifths as wide as long ; the inferior surface excavate for the recep- 

 tion of the reflexed propodus; the carpus is shorter than the 

 fingers, node-like, with the upper, outer angle nearly right- 

 angled, knob-like ; the propodus is curiously twisted, trigonal, with 

 the thickest area occurring about two-fifths of the length from 

 base, narrowed distally; the propodus is about as long as the 



