454 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



of carapace ventral to cardiac notch. Front (fig. 50) depressed, 

 deeply indented medially, covering eyes with two hoods. Anterior 

 margin (fig. 51) evenly curved, rounded at junction with lateral 

 margin. Carapace increases in width to base of first legs, decreasing 

 slightly to rounded posterior. Ventral part of posterior margin 

 concave, then angled sharply to cardiac notch. 



Abdomen smoothly rounded, bearing few scattered fine setae. 

 Posteroventral margins of pleura of fu-st three segments rounded, 

 those of fourth and fifth bluntly square. Ventral margin of fu-st 

 pleura with plumose setae. 



Telson (fig. 65) wide, flattened, longer than sixth abdominal seg- 

 ment. Two pairs of movable spines dorsally; posterolateral spines 

 well developed, outer pair smaller. Posterior margin curved, bordered 

 with bristles and plumose setae. 



Eye round, with sharp tubercle on stalk. 



Antennule short, stout. Stylocerite reaches nearly to end of second 

 segment of peduncle; margins curved. Peduncle less than % carapace 

 length. Slender inner flagellum scarcely as long as carapace, outer 

 shorter, with fused portion about as long as peduncle, with four free 

 sensory joints and slender terminal flagellum. 



Antenna with peduncle longer than that of antennule. Margin of 

 fu-st segment produced into sharp tooth ventrally. Scale (fig. 56) 

 broad, with stout spine, which is longer than blade and separated 

 from it for distal thhd. Flattened flagellmn ahnost as long as carapace. 



Third maxilliped reaches to end of antennular peduncle. Ischio- 

 meropodite subequal in length to last segments together (penultimate 

 slightly shorter). Medially armed with long bristles, distal seg- 

 ment with bands of bristles as well. Exopodite stout, longer than 

 ischiomeropodite. 



First legs (fig. 66) subequal. Ischium short. Merus, short, wide, 

 triangular in cross section. Smooth doreal ridge ending distally in 

 sharp curved tooth, with few bristles on margin. Outer ventral ridge 

 smooth, inner with ten long bristles. Carpus cup-shaped but some- 

 what elongate; no setae. Chela elongate with few setae on cutting 

 edges and tips of fingers, which are crossed over each other. Dorsal 

 margin of hand evenly rounded, not knifelike. Palm longer than 

 fingers, considerably less than ji as wide as long. Little gape between 

 fingers. 



Second leg (fig. 67) slender. Ischium slightly longer than merus, 

 together longer than carpus, which has first joint longer than fifth, 

 and about as long as second, third, and fourth together. Chela 

 slender, with fingers shorter than palm and with spinulate cutting 

 surfaces. 



Third leg (fig. 77) stouter than second. Merus only slightly dilated. 



