MUSEUM OF COMPARATIVE ZOOLOGY. 89 



carpus ; the carpus is slightly shorter than the raerns, and only about a third 

 as wide ; the propodus is very nearly as long as the carpus, but a little nar- 

 rower; the dactylus itself is a little broader than the propodus, but less than 

 halt" as long, broadest at the middle and with the tip triangtdar and armed 

 with a slender spine not much shorter than the segment itself ; both edges 

 of the dactylus, the extremity and inner edge of the propodus, and the inner 

 edge of the carpus, are armed with exceedingly long and slender setiform 

 spines, and the inner sides of the proximal segments are, as usual, armed with 

 setae. The exopod is slender, reaches a little beyond the ischium, and is dis- 

 tinctly multiarticulate to near the base. The epipod is narrow, and not longer 

 than the breadth of the ischium. 



The first and second pairs of legs (PI. XV. figs. 1, 2) are very nearly equal 

 in length, the first pair reaching about to the extremities of the peduncles of 

 the antennae, and the second pair scarcely falling short of the same point. In 

 both pairs the corresponding segments are of very nearly equal lengths, except 

 the carpi which are a very little longer in the second pair, but the ischia, meri, 

 and carpi are narrower in the second than in the first : the ischium is about 

 two thirds as long as the merus, half as broad as long in the first pair, and 

 scarcely more than a third as broad as long in the second ; the merus is nearly 

 a third of the entire length of the endopod, slightly narrowed distally, and in 

 the first pair more than a third as broad as long, but in the second pair scarcely 

 more than a fifth as broad as long ; the carpus in the first pair is about two 

 thirds as long and half as wide as the merus, while in the second pair it is abso- 

 lutely a little narrower than in the first ; the chelae are very nearly alike in 

 both pairs, about as long and broad as the carpus in the second pair, with the 

 fingers slender, curved at the tips, and scarcely more than two thirds as long 

 as tlie basal portion ; the edges of the chelae are furnished with fascicles of short 

 setfe, the tips of the fingers densely clothed with much longer setae and hairs, the 

 inner edges of the other segments thickly clothed w"ith plumose hairs and long 

 setae, and the outer edges sparsely clothed with short hairs, except on the carpus 

 in the second pair where the outer edge is thickly hairy. The legs of the third 

 pair are considerably longer and much more slender than those of the second, 

 beyond which they reach by the length of their chelae ; the ischium is about as 

 long as. in the second pair, but narrower ; the merus is twice as long as the 

 carpus, very slender, and of nearly equal diameter throughout ; the carpus is a 

 little shorter and scarcely stouter than the merus, and very .slightly thickened 

 distally ; the chela is very near the same size as in the first and second pairs, 

 but the fingers are apparently a little longer in proportion. 



The third and fourth pairs of legs are nearly alike, a little longer than the 

 third pair and very slender, the fifth being a little more slender than the fourth, 

 and both sparsely armed with long setiform spines, except upon the dactyli, 

 which are nearly naked, long, very slightly curved, and acute. 



The abdomen to the tip of the telson is about twice as long as the carapax, 

 anteriorly about as broad as the carapax and with the dorsum broadly rounded, 

 but much compressed posteriorly^ so that the sixth somite is twice as high as 



