iQOQ-] A- Ai^cocK : New Freshwater Crabs. 251 



ischium of the external maxillipeds longitudinally grooved ; the 

 antero-lateral borders of the carapace cut into four salient spines, 

 exclusive of the external orbital tooth ; the carapace only slightly 

 convex, broadly corrugated transversely (as in P. fece, de Man), and 

 closely covered with a short spongy tomentum. 

 From Cachar. 



Potamon {Paratelphiisula) calvum, sp. nov. 



The exposed surface of the ischium of the external maxillipeds 

 is not grooved longitudinally ; the antero-lateral borders of the 

 carapace are cut into four spines, exclusive of the external orbital 

 tooth ; and the carapace convex. 



It is closely related to P. crenuliferum, Wood-Mason, from 

 which it chiefly differs in having a convex, somewhat orbicular 

 carapace, with more spiniform lateral teeth. 



From Upper Tenasserim. 



Genus Paratei^phusa. 



Subgenus Phricotelphusa. 



Paratelphusa {Phricotelphusa) gageii, sp. nov. 



This species is allied to P. callianira, de Man, and P. carinifera, 

 de Man, but more closel}^ still to P. elegans, de Man. The carapace 

 has the usual one pair of blunt epigastric crests : in the external 

 maxillipeds the exopodite is as long as the ischium (which is 

 longitudinally grooved) and is sometimes non-flagellate, and some- 

 times has a papillar or filiform (never plumose) flagellum : the 

 lateral epibranchial tooth is small or obsolescent : the length of 

 the 6th abdominal segment of the adult male is barely equal to 

 its distal breadth: the antennal flagellum is small but distinct : and 

 the anterior part of the front is vertically deflexed, but does not 

 appear as a distinct facet as it does in P. elegans. I,ike all the 

 species of this subgenus it is small. 



From Sureil near Kurseong, where, thanks to the hospitality 

 of Captain A. T Gage, I. M.S., Superintendent of the Botanical 

 Gardens and of the Cinchona Plantations, I collected a fine series 

 of this species. 



Subgenus Barytelphusa. 



Paratelphusa {Barytelphusa) lamellifrons , sp. nov. 



Close to P. jacquemontii, Rathbun ( = " Telphusa indica" of 

 many authors), from which it chiefly differs in the form of the 

 front and of the post-orbital crests. The front is a thin projecting 

 plate far overhanging the epistome : the post-orbital crests are 

 thin, elegantly crenulate, and have their outer ends lobe-like and 

 continuous with the edge of the carapace just in front of the 

 lateral epibranchial tooth. 



From Travancore. 



