119 



fine, superficial, and indistinct groove where it delimits the mesogastric area 

 posteriorly, and (2) on either side, as a sort of scar-like marking lietween the 

 gastric and branchial regions. The post-frontal mesogastric groove is long and 

 shallow, invading the frontal region and distinctly bifm-cating posteriorly. 



Front in the adult half the greatest breadth of the carapace, square-cut, 

 almost vertically deflexed, with a smooth, almost straight edge. External 

 orbital angle obsolete, the lower border of the orbit being more prominent than 

 the upper border and meeting it without any break. 



Antero-lateral borders of carapace very short, very slightly arched, sub- 

 cristiform. Lateral epibranchial tooth distinct but hardly acute, closely approxi- 

 mated to the orbit. 



Epigastric crests very low, broad, and 1 )lunt ; under magnification marked 

 with vermicular depressions. Post-orl^ital crests distinguishable only as a 

 slight tumescence on either side. 



Abdomen of the adult male a broad-based elongate triangle in outline ; 

 5th segment peculiarly narrow, its length being equal to its distal breadth ; 6th 

 segment also very narrow, its length considerably exceeding its distal breadth, 

 which sHghtly exceeds its proximal breadth ; 7th segment broadly rounded at 

 apex, much longer than l)road. In the adult female the abdomen is broad, but 

 the 7th segment is miusually long and triangular, its length being about 

 three-quarters its basal breadth. 



The antennular fosste are peculiarly narrow ; they are never widely open 

 to the orbit, Init either they are closed externally by the contact of the front 

 with the epistome, or if they are narrowlj^ open, the opening is closed by the 

 tightly impacted and very obliquely disposed antennal peduncle. 



The elements of the antennal peduncle are extremely hard to distinguish, 

 and no antennal flagellum can be detected. 



In the mandibular palp all three segments can be made out, and the 

 terminal segment is of the typical Paratelphusa type, being bifurcate from the 

 base, so that the two lobes embrace the incisor process of the mandible. 



In the external maxillipeds the exopodite is verj^ short and is hairy and 

 pointed and non-flagellate ; the ischium has a faint longitudinal groove on its 

 ventral sm'face ; and the merus is quadrangular, with its antero-external angle 

 nearly right, and is a little broader than long. 



Chelipeds in both sexes very unequal ; carpus and hand smooth to the 

 naked eye ; the carpus has its inner angle spiniform, and has some tufts of 

 blackish bristles along its anterior border ; in both chelae the fingers are fairly 

 evenly toothed and are pointed, and the dactylus is longer than the palm ; in 

 the larger chelae the fingers meet only at tip. 



The legs are slightly longer than the smaller cheliped ; they are studded 

 with little tufts of long, very stiff" and coarse bristles ; the bristles are black with 

 yellow tips, and there are only three or four in each tuft. 



