376 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.39. 



First and second free segments the same width, which is two-thirds 

 that of the carapace, the second segment a little the longer. Remain- 

 ing free segments diminishing regularly in width, the third and fourth 

 the same length as the second, the fifth about half as long. Genital 

 segment barrel-shaped, the same width as the fifth segment, a little 

 longer than wide and contracted posteriorly in front of the abdomen. 



Abdomen half the width of the genital segment, two-jointed, the 

 segments equal in length, the terminal one somewhat narrower than 

 the basal. Anal laminae large, covering together almost the entire 

 width of the terminal segment and two-thirds as long, each armed 

 with two terminal setae, of which the inner is twice the length of the 

 outer, and three short spines, one at the outer distal corner, another 

 on the ventral surface near the tip, and the third on the lateral margm 

 nearer the base. 



The terminal joint of the abdomen and the anal laminae have large 

 patches of coarse hairs upon their ventral surface, arranged as shown 

 in fig. 185. 



First antennae distinctly six-jointed, the basal joint not enlarged 

 nor projecting as much as in the female, but armed with the same 

 fringe of broad plumose setae. No tactile hairs, however, could be 

 found among these setae. Second antennae with the two terminal 

 joints heavily corrugated and tipped with five curved claws, which 

 diminish regularly in size from within outward. 



Labrum shield-shaped, one-third longer than wide, with short 

 rounded projections at the center of the anterior and posterior mar- 

 gins and a reentrant sinus on each lateral margin one-third of the 

 distance from the anterior end (fig. 40) . 



Mandibles similar to those of the female, with a small secondary 

 spine at the base of the larger terminal one on the inner side. 



First maxillae with three long plumose setae, the central one the 

 shortest; second pair with a single terminal spme and without the 

 accessory ciliated spine found in the female. 



Maxillipeds in normal position behind the other mouth-parts, 

 consisting of a swollen basal joint and a slender terminal claw, the 

 same length as the basal joint and curved near its tip so as to fit 

 tightly against the posterior margin of the basal joint when flexed. 

 The mside of the claw and the margin of the basal joint against which 

 it fits are covered with short saw-teeth. 



First swimming legs not widened nor fringed with broad plumose 

 setae as in the female, but consisting of a broad basal portion and two 

 narrow rami armed with spines and setae like the other legs (fig. 219). 



Endopod of fourth legs two-jointed, the termmal joint twice the 

 length of the basal and tipped with three setae. Above the base of 

 each of the fifth legs there projects from the dorsal surface of the fifth 

 thorax segment a single long nonplumose spine. 



