92 BULLETIN 2 01, UNITED STATE'S NATIONAL MUSEUM 



peduncle; antennal peduncle (fig. 25, a) extends halfway along the 

 third joint of the antennular peduncle. 



Carpopropodus of the endopod of the third to the eighth thoracic 

 limbs divided into about 12 subjoints, dactylus absent. 



Inner uropods (fig. 25, g) with five spines along the inner margin, 

 widely spaced from the statocyst to near the apex. 



Outer uropod (fig. 25, g) with eleven spines on the outer margin. 



Telson (fig. 25, /) rather long and narrow, somewhat more than 

 three times as long as broad at the base, with 10 to 12 spines on each 

 lateral margin, the last two of which are longer than the remainder ; 

 cleft about one-tenth of the length of the telson with the usual ser- 

 rated margins. 



First pair of pleopods of the male (fig. 25, b) with the sympod 

 rather narrowly ovate, with seven long setae on the outer margin; 

 endopod one-jointed and shorter than the first joint of the exopod; 

 exopod five jointed, the first joint as long as the remaining four 

 combined. 



Second pair of pleopods of the male (fig. 25, a) with the sympod 

 three times as long as broad, about equal in length to the endopod 

 and considerably shorter than the exopod; endopod 5-jointed, the 

 first joint iy 2 times as long as the remaining joints combined, a strong 

 seta near the distal end of the first joint, another at the junction of 

 the first and second joints, and two setae, one shorter than the other, 

 on the terminal joint; exopod longer than the endopod, composed of 

 nine joints, the first joint as long as the combined length of the re- 

 maining joints, sixth joint with a short seta on the inner corner, seventh 

 joint with a long plumose seta on the outer corner and a short stout 

 hooklike spine on the inner corner, ninth joint terminated by a short 

 straight seta. 



Third pleopod of the male (fig. 25, d) very long and stylif orm, reach- 

 ing backward almost to the end of the telson, sympod three times as 

 long as broad ; endopod very short and one jointed ; exopod very long 

 and three jointed, the first and second joints subequal in length and 

 nearly one and a half times as long as the sympod, both joints narrow, 

 first joint with three setae about the middle of the outer margin, third 

 joint half as long as the second and terminated by a single very long 

 and strong spine one and a half times as long as the third joint, which 

 appears to fit into a kind of socket on the third joint. 



Fourth and fifth pairs of pleopods of the male (fig. 25, e) similar, 

 with the sympod shorter than the endopod, latter 1-jointed, exopod 

 longer than the endopod and 3-jointed. 



Length of adult specimens of both sexes, 6 mm. 



Type lot. — U.S.N.M. No. 81256, 58 males, 13 females, breeding, Nato 

 Anchorage, Lagonoy Gulf, Luzon. 



