214 Bulletin, Vanderhilt Marine Museuin, Vol. II 



the merus and folds around its distal and inner margin. The palp 

 is tipped with a tuft of setae; the inner lateral margins are heavily 

 setiferous. 



The ehelipeds are markedly unequal in both sexes; sometimes in 

 old males the claw is of greater size than the body. The merus is 

 three-sided; spinulose along the lateral margins; the carpus is eon- 

 vex on the upper surface, armed with an acute tooth at the inner 

 angle ; in old specimens this tooth is frequently obsolete ; the propodus 

 is high, suboval; the height of the palm in the female is equal to its 

 length on the lower margin and exceeds that of its upper margin; 

 the fingers of the larger claw are triangulate, gaping, spoon-tipped, 

 with a few weak teeth. Those of the other hand are less or not at all 

 gaping. 



The ambulatories are slender, the second pair longer than the first 

 and third, which are subequal; the fourth pair is shortest, scarcely 

 reaching to the tip of the propodus of the third pair. All four pairs 

 have the meral joint stout, slightly wider than the remaining joints. 

 The carpus is one-half as long as the propodus, which is three-fourths 

 as long as the merus; the dactyli are strong, slender, acuminate, as 

 long as the propodus ; both lateral margins are lightly carinated. The 

 distal three joints are set moderately with tufts of bristly setae. The 

 carpal and propodal joints are scarcely half as wide as the meral, 

 slender, subcylindrical, setose; the carpus is scarcely half the length 

 of the meral and is armed with a spine at its posterior distal angle ; 

 the propodal joint is approximately twice the length of the carpal; 

 the dactyl is a trifle less than half the length of the propodus and is 

 very acuminate, tipped and armed with a series of five or six horn- 

 like spines on the inferior lateral margin; there is a cluster of simi- 

 lar spines at the inferior distal margin of the propodus. 



The female abdominal belt is oval, seven-segmented; the sixth seg- 

 ment is more than twice as wide as the fifth, the distal segment is 

 abruptly smaller, subtriangulate with its tip rounded. 



The male belt is also seven-segmented and externally differs slightly 

 from the female in that it is more triangular than oval; the sixth 

 segment is practically twice the length of the preceding segment. The 

 first pair of appendages are straight, stocky, triquetral, the tips 

 slightly flattened laterally and rounded, each tip armed with an 

 oblique, rounded appendage and above this a small, straight process 

 which does not extend beyond the rounded extremity of the thickened 

 portion. 



