40$ A. Alcock — Carcinological Fauna of India. [No. 3, 



wrist spiniform ; the upper border of the palm is granulate, a finely 

 beaded raised line traverses the lower part of the outer surface of the 

 palm and fixed finger, and there is a very short series of granules near 

 the middle of the inner surface of the palm : the palm is nearly as 

 high as long, and the dactylus is much longer than the tipper border 

 of the palm and closes against the fixed finger by the tip only. 



The 2nd pair of legs, which are the longest, are not much short of 

 twice the length of the carapace ; the 4th pair, which are the shortest, 

 are but little longer than the carapace. In all the legs, the meropodite 

 has some fine rugosities on its upper surface, a spine near the far end of 

 the anterior border, and some spines on the posterior border — these being 

 most numerous in the case of the 4th pair of legs : and in all, the 

 edges of the 3 terminal joints are hairy but not plumose, nor are these 

 joints broadened or compressed. • 



In the Indian Museum are two very small male specimens from 

 Mergui. 



96. Pi/xidognathus fluviatilis, n. sp. 



Carapace transverse, markedly convex, finely punctate, the regions 

 indicated only by an H-shaped mark in its centre. 



Front between two-fifths and a third the greatest breadth of the 

 carapace, deflexed, sinuous or four-lobed, the two middle lobes broad, 

 the outer lobes (= inner orbital angles) subacute. 



Antero-lateral borders of the carapace slightly arched, cut into 

 three prominent acute teeth (including the outer orbital angle) of which 

 the first is the largest and least acute, and the third is spine-like. 



Orbits of good depth, the upper border slightly sinuous, the 

 lower border defined by a granular ridge running close behind the 

 prominent denticulated ridge that bounds the infra-orbital region of the 

 carapace. 



Anterior border of buccal cavern prominent, finely crenulate. 

 Exognath in the female broader than the ischiognath, and having a 

 smooth convex surface. 



Chelipeds in the female about as long as the carapace, more massive 

 than the legs: inner angle of wrist acnminate : a raised line runs along 

 the outer surface of the palm and fixed finger, close to the lower border: 

 fingers rather sharp though spooned at tip, dactylus hardly twice the 

 length of the upper border of the palm, longer and rather less strongly 

 toothed than the fixed finger. 



All the leg-joints are plumed, and all the dactyli are long compressed 

 and recurved. In all the legs there is a very strong spine in the distal 



