442 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



lateral margin somewhat undulate. Posterolateral margin curved, 

 posterior margin angled below deep cardiac notch. 



Abdomen smoothly rounded, with postero ventral margins of first 

 to third segments rounded, those of fourth and fifth angled. First 

 and fifth pleura ventrally margined with plumose setae. Minute 

 setae on smooth surface. 



Telson (fig. 27) longer than sixth abdominal segment, nearly twice 

 as long as wide, outer margin slightly undulate. Two pairs of movable 

 spines on dorsal sm'face, two spines on each posterolateral angle; 

 outer spines very small. Posterior margin deeply curved; plumose 

 setae relatively short. 



Eye round. Sharp cone-shaped tooth on median part of short, 

 stout eyestalk. 



Antennule with stout peduncle of three subequal segments. Broad- 

 based scimitar-shaped stylocerite reaching almost to end of second 

 segment. Outer flagella with stout fused portion before division into 

 short sensory part and much longer, slender flagellum. Peduncle 

 with large tooth ventrally. 



Antenna with stout peduncle slightly longer than antennular 

 peduncle. Distal margin of basis produced into sharp tooth. Scale 

 (fig. 22) broad; wide spine exceeding blade, and separated by distinct 

 slit distally, outer margin straight. Scale reaches nearly to end of 

 antennular peduncle. Flagellum longer than carapace, flattened ovoid 

 in cross section. 



Third maxilliped reaching to last segment of antennular peduncle. 

 Ischiomeropodite flat, relatively narrow, curved over mouth parts, 

 slightly shorter than exopodite, about twice as long as ultimate, four 

 times penultimate segment. Medial surfaces all armed with bristles, 

 which are particularly dense on distal segment. 



First legs (fig. 32) usually similar in size and shape, with chela much 

 shorter than carapace. Ischium short. Merus slender, increasing in 

 size distally, somewhat triangular in outline with scattered tubercles. 

 Shallow groove on outer side where second leg fits. Carpus short, 

 smooth, cup-shaped, with sHght dorsal and larger ventral flattened 

 projection. Chela narrow elongate, covered with fine spines. Fingers 

 longer than palm, narrow gape, with one large flat tooth medially on 

 fixed finger, another proximally, which meshes with similar one on 

 dactylus. Curved corneous tips cross and intermesh. Chela sub- 

 rectangular, but deepest at base of dactylus. There may not be any 

 large teeth nor any gape when fingers are closed, particularly in small 

 individuals (fig. 33). 



Second leg (fig. 40) slender, with ischium subequal to merus. First 

 joint of carpus slightly longer than next three together, subequal to 



