46 BULLETIN OF THE 



otherwise unarmed ; the carpus is short, about as broad as long, and unarmed, 

 and is so articulated with the merus as to be capable of flexion backward 

 and beneath it ; the propodus is slightly more than half as long as the merus, 

 rounded, slightly swollen, tapers to a very narrow distal extremity, and is smooth 

 and unarmed except upon the upper and inner side where it is furnished with 

 three longitudinal series of fascicles of soft setse ; the dactylus is about half as long 

 as the propodus, very slender, curved and acute, smooth and naked, and capable 

 of nearly complete flexion on the setigerous side of the propodus. The manner 

 in which the distal segments of these limbs are articulated brings the setigerous 

 sides of the propodi and the points of the dactyli in direct opposition to the 

 spinous sides of the two distal segments of each of the external maxillipeds, and 

 these two pairs of appendages are probably used together as prehensile organs. 



The legs of the second pair are unarmed and naked, very slender, the distal 

 portion but little stouter than the proximal part of the flagellum of the antenna, 

 and a little unsymmetrical, the left being slightly stouter than the right and 

 reaching nearly to the tip of the rostrum, while the right reaches a little be- 

 yond : the coxa is short and nearly cylindrical ; the ischium is a little longer 

 than the propodus in the first pair, much broader than the coxa, very much 

 compressed vertically and the inner edge slightly expanded proxinially, so that 

 the breadth is about a fourth of the length ; the merus is about a fourth 

 longer than the ischium, the right a little longer than the left, little more than 

 half as broad as the ischium, nearly uniform in breadth, and compressed verti- 

 cally but much less so than the ischium ; the carpus is more than twice as long 

 as the merus and more slender, strongly compressed, very slightly tapering at the 

 distal end, composed of thirty-one segments on the right side and twenty-three 

 on the left, and the most distal segment in each about as long as the three next 

 taken together ; the left chela is slightly larger than the right, but neither is 

 larger than the distal segment of the carpus, the digits are both short, the pre- 

 hensile edge of the propodal one considerably oblique and shorter than the 

 dactylus, which is itself scarcely longer than the breadth of the propodus. 



The legs of the third pair are nearly naked, slender, and reach to the tip of 

 the rostrum : the merus is about twice as long as the ischium, and these two 

 segments taken together are longer than the three distal segments and are of 

 nearly uniform diameter throughout and very slightly compressed ; the carpus 

 is a little shorter and more slender than the ischium ; the propodus is nearly 

 twice as long as the carpus, cylindrical, and slightly tapered distally ; the dac- 

 tylus is narrower than the distal end of the propodus, nearly a fourth as long 

 as the propodus, nearly straight, a little compressed vertically, and tapered 

 from the bus,, to the tip. The fourth and fifth pairs of legs are alike and very 

 similar to the third pair, but are Blightly stouter throughout, the propodus ii 

 furnished with a dense fascicle oJ seta outside the base of the dactylus, and the 

 dactylus itself is considerably longer than in the third pair, strongly compressed 

 vertically, concave above and convex below, and lanceolate, being broader in 

 the middle than the distal end of the propodus, but DBXfOWed toward the base- 

 and tapered to an acute tip. 



