8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Abdomen with longitudinal grooves on second to fifth somites; 

 fifth somite with 3 broad carinae, upper short, parallel to body- 

 line, middle oblique, extending to posterior margin, lower swollen, 

 subparallel with upper; posterolateral margin of fifth somite (oc- 

 casionally fourth) armed with small spine; sixth somite Avith 6 

 carina te marginal spines; broad, unarmed accessory carinae present 

 between submedian and intermediate carinae as well as between 

 intermediates and laterals; submedian carinae slender; intermediate 

 carinae very broad, widening anteriorly, sides sharp; lateral carinae 

 swollen, inconspicuous; sixth somite with small lateral spine anterior 

 to articulation of each uropod. 



Telson less than twice as broad as long; accessory median carinae 

 subdivided into 3-6 lobes, each armed with slender spine; submedian 



dorsal carinae with 1-2 denticles ventral to apical spine; intermediate 

 carinae with 1-2 inner and one outer lobes or spinules ventral to each 

 apical spine, outer and/or inner connected to low ridge extending 

 anteriorly around apex; lateral carinae uninterrupted dorsally, with 

 1-2 sub terminal tubercles or spinules; marginal carinae irregular but 

 entire; anterior surface of telson mth 1 pair of dorsal, submedian, 

 rounded tubercles; submedian and intermediate marginal teeth with 

 short dorsal carinae. 



Uropodal exopod with 8 slender movable spines on outer margin 

 of proximal segment, distal extending past midlength of distal segment ; 

 endopod slender, curved; basal prolongation lacking lobe between 

 apical spines; inner margin of basal prolongation with 5 slender 

 spinules. • 



