12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. im 



Antennular peduncle elongate, over half as long as carapace; dorsal 

 processes of antennular somite visible lateral to rostral plate as slender, 

 sharp, anteriorly directed spines. 



Antennal peduncle not extending beyond eye; antennal scale slender, 

 curved, less than half as long as carapace. 



Rostral plate longer than broad, margins proximally subparallel, 

 distally convergent on rounded apex; median carina absent. 



Carapace strongly narrowed anteriorly, completely lacking median 

 and intermediate carinae; posterior fourth of carapace with reflected 

 marginal carinae only; posterior margin straight; anterior margins 

 slope posterolaterally to strong anterolateral spines, which do not 

 extend to base of rostral plate. 



Raptorial claw slender: dactyl us with 5 teeth, outer margin flat- 

 tened, with proximal notch flanked distally by rounded lobe; dorsal 

 ridge of carpus terminating in low, rounded tubercle. 



Mandibular palp and 4 epipods present. 



Exposed thoracic somites lacking submedian carinae, least 3 somites 

 with well-formed, unarmed intermediate carinae; lateral process of 

 fifth somite a short, sharp, slender, anterolaterally directed spine; 

 fifth somite with ventral tubercle under each lateral spine; lateral 

 processes of sixth and seventh somites not bilobed, obliquely truncate, 

 rounded anterolaterally and posterolaterally; ventral keel of eighth 

 somite prominent, rounded, projecting ventrally. 



Abdomen broad, depressed, first 5 somites lacking submedian 

 carinae; abdominal carinae spined as follows: submedian, 6; inter- 

 mediate, 5-6; lateral, 6; marginal, 5; sixth somite with ventrolateral 

 spine in front of articulation of each uropod. 



Telson broader than long, with 3 pairs of sharp marginal teeth, 

 submedians with movable apices; prelateral lobes absent; carinae of 

 submedian and intermediate teeth nodulose, marginal carinae smooth; 

 telson ornamented dorsally with a series of anterior tubercles, a sub- 

 median line of tubercles on each side of median carina converging 

 under its apex, and 6-7 short, curved lines of tubercles; median 

 carina with slender spine and ventral tubercle under spine; denticles 

 sharp, 2-3, 7-8, 1; ventral surface of telson with postanal keel. 



Outer margin of proximal segment of uropodal exopod with 6 

 slender, curved spines, last extending about to midlength of distal 

 segment; proximal segment of exopod with longitudinal dorsal carina; 

 endopod slender, curved; basal prolongation with 7 slender spines on 

 inner margin and broad rounded lobe on outer margin of longer inner 

 spine. 



Color. — Almost completely faded; some dark chromatophores pres- 

 ent on anterior appendages, arranged in lines on propodus of claw; 



