77 



of the carapace in the adult ; its sides very oblique, forming an open curve 

 with the upper border of the orbit ; its edge sharp, very broadly and obscurely 

 bilobed. Orbits and their antennal gap very wide ; external orbital angle 

 subacute, not separated from lower border of orbit by any gap. 



Antero-lateral borders of carapace sharp, moderately curved, not quite as 

 long as postero-lateral borders ; armed with three strong teeth exclusive of the 

 orbital angle. 



Epigastric cx-ests slightly overlapping and in advance of post-orbital crests ; 

 they consist of a sharp subcrescentic edge and an anterior vermicular-eroded 

 surface. Post-orbital crests usually distinct and sharp at their inner end, blunt 

 and rather indistinct behind the orbits, and forming a very oblique crescentic 

 bulge behind the external orbital angle. 



Abdomen of adult male broad-based and remarkably constricted, hour- 

 glass fashion, in the middle ; 5th segment small but broad, its length half its 

 proximal breadth ; 6th segment long, broadened in its distal half, its length 

 being nearly twice its basal breadth ; 7th segment tongue-shaped, longer than 

 broad. 



Mandibular palp of the typical Paratelphusa form. Mouth-parts as in 

 P. spinigera, except that the merus of the external maxillipeds is longer and 

 squarer. 



Chelipeds unequal, very much more so in the male than in the female ; 

 the subterminal spine of the upper border of the merus is sometimes coarse 

 and worn ; surface of carpus and hand almost smooth to the naked eye, though 

 under a lens the surface of the carpus is vermicular-rugose ; a spine, as usual, 

 at the inner angle of the carpus. Fingers much longer than the palm ; in the 

 smaller chelse they are rather slender and fairly straight, and though the teeth 

 are not uniform or regular none of them is greatly enlarged ; in the larger 

 chelse of the adult male the fingers are stout, the dactylus is strongly curved so 

 that the fingers meet only at tip, and some of the teeth at fairly regular 

 intervals, in both fingers, are much enlarged ; the curving of the dactylus varies 

 with age in the male, and is never so much marked in the female. 



Legs about as long as the smaller cheliped ; in all of them there is a 

 subterminal spine on the anterior border of the merus. 



In a large male the carapace is 1 J inch long, lyV inch broad, and fths inch 

 deep ; and the length of the hand (fingers included) is If inch, the maximum 

 length of the palm being Hths inch, of the dactylus 1t» inch. 



This species fives both in fresh and brackish water, and is found from 

 Bm-ma eastwards to China along the coast. 



-J — Moulmein. Museum Collector. Many siieeimens. 



