448 PROCEEDINGS OF THE NATIONAL MUSEUM vol. us 



posterolateral margins evenly rounded except fifth, which is somewhat 

 acute. 



Telson (fig. 58) wide, flat, shorter than uropods. One and one-half 

 to twice length of sixth segment. Lateral margins curved. Distally 

 about % as wide as proximally. Two pairs of small movable spines 

 on distal half of dorsal sm-face, but posterolateral spines vestigial or 

 missing. Posterior margin cm'ved, bearing long plumose setae. 



Eye large, round, on short stalk with small median tooth. 



Antennule with stylocerite narrow, sharp-pointed, reaching to distal 

 quarter of second segment of peduncle. Ventrally a slender scimitar- 

 shaped tooth on distal part of first segment of peduncle. Peduncle 

 slender, about % carapace length. Second segment about twice length 

 of subequal first and third segments. Flagella slender, short: outer 

 flagella fused for most of length with only terminal tip of sensory part 

 free and remaining flagellmn short, slender. 



Antenna slender. Peduncle with wide tooth ventrally on margin of 

 first segment; slightly longer than antennular peduncle. Scale (fig. 

 54) narrow, with stout spine longer than narrow blade, separated from 

 it with slit for about % of length. Flagcllum longer than carapace, 

 ovoid in cross section. 



Third maxilliped reaching to end of second segment of antennular 

 pedmicle. Relatively narrow, with flattened ischiomeropodite sub- 

 equal to distal segment, sparsely bristled. Penultimate segment 

 sparsely setose, slightly shorter than distal, which is armed medially 

 with bands of stout bristles and scattered longer setae. Exopodite 

 slightly longer than ischiomeropodite. 



First legs subequal, large. Chela slightly shorter than carapace. 

 Ischimn short. Merus naked except for few setae on inner margin: 

 triangular in cross section, wdth dorsal carina smooth, sharp, ending in 

 curved tooth distally, outer ventral ridge smooth, inner one \vith some 

 flattened tubercles. Carpus short, smooth, naked, cup-shaped with 

 small ventral plate. Chela (fig. 60) smooth, flattened laterally: few 

 fine scattered setae on dorsal ridge, stifT setae near tips of fingers and 

 on cutting surfaces. Palm and fingers subequal but fixed finger much 

 wider than dactjdus. Somewhat flattened teeth of cutting surface 

 may mesh without any gape or may have hiatuses on both fingers 

 resulting in a round foramen. Chelae usually alike in dentition. 

 Dorsal ridge of fixed finger and palm compressed, so that margin 

 knife-edged. 



Second leg (fig. 61) slender. Ischium longer than merus; both flat- 

 tened laterally. Carpus with first joint longest, fifth next, others 

 shorter, subequal. Chela longer than first joint, fingers subequal to 

 palm. Cutting smface of fingers spinulate. 



Third leg (fig. 73) stout, flattened laterally, with scattered fine 



