44 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
DerscripTion.—LHye large, cornea bilobed, set obliquely on stalk; 
ocular scales subtruncate, inclined laterally; rostral plate as long as 
broad, or broader than long, trapezoidal, upturned lateral margins 
converging on truncate or rounded apex, median carina absent; 
median carina of carapace lacking well-marked anterior bifurcation; 
intermediate carinae of carapace not extending to anterior margin; 
anterolateral spines of carapace well developed but not extending to 
base of rostral plate; dactylus of raptorial claw with 6 teeth, outer 
margin sinuous; dorsal ridge of carpus of claw with large, irregular 
tubercles; inferodistal angle of merus of claw with broad, obtuse 
projection; mandibular palp present; 4 epipods present; last 3 thoracic 
somites with submedian and intermediate carinae, none armed; 
anterior lobe of lateral process of fifth thoracic somite a slender, 
anteriorly directed spine, posterior lobe short, slender, apex rounded, 
directed laterally; anterior lobe of lateral process of sixth thoracic 
somite slender, posterior lobe much larger, triangular, apex acute but 
not spiniform; anterior lobe of lateral process of seventh thoracic 
somite more obtuse than on sixth, posterior lobe similar to that of 
sixth somite; second to fifth abdominal somites with anterior tubercles 
between intermediate and lateral carinae; abdominal carinae spined 
as follows: submedian (8-4) 5-6, intermediate 3-6, lateral (1) 2-6, 
marginal 1-5; telson broad, with 3 pairs of marginal teeth, submedians 
and intermediates slender, sharp; prelateral lobes present; denticles 
rounded, 2-4, 7-9, 1; dorsal surface of telson roughened, with sub- 
median row of tubercles converging under posterior apex of median 
carina, lateral surface between lines of pits raised, irregular, almost 
carinate; margin of telson in males more swollen than in females; 
postanal keel present; uropod with 8-9 movable spines on outer margin 
of proximal segment of exopod; basal prolongation of uropod with 
small rounded lobe, margin concave, on outer margin of inner spine 
in adults, lobe spiniform in juveniles and subadults. 
Cotor.—In preservative, carapace with median oval patch and 
posterior dark line, body segments each with posterior dark line; 
second and fifth abdominal somites with broad, dark median patch; 
narrower on fifth somite; uropodal exopod with dark spot at articu- 
lation of distal segment, inner half of distal segment dark; distal 
half of endopod dark. 
Color in living specimens may be bright and variable; there is also 
evidence of sexual dimorphism in color of the telson. The carinae 
and gastric grooves of the carapace are orange, and the posterior 
margin is orange and yellow. The submedian carinae of the abdomen 
are orange, and each abdominal somite is lined posteriorly with 
orange; other carinae are blue or green anteriorly, more yellow 
posteriorly, and the intermediate and lateral carinae of the sixth 
