66 



In an adult female the carapace is liV inch long, IfV inch in greatest 

 breadth, and xVths inch deep ; adult males are a little smaller. 



Notwithstanding the more numerous marginal teeth, I am inclined to 

 regard this Potamon as only a variety of de Man's P. fece. 



6611-6645 r, , , p ^ , T w J lu f 13 (J, 17 ? , and 



. Darband Pass, Cachar. J.Wood-Mason. { 



9 ' L numerous young. 



^. Cachar. E. B. Baker. 1 <J , 2 $ . 



38. PoTAMON (Acanthotelphusa) fe/E, de Man. (Fig. 51.) 



Paratelphiisa fece, de Man, Ann. Mus. Genoa (2), XIX., 1898, p. 393, pi. iv., fig. 3. 



Potamon {Paratelphusaj few, Mary J. Rathbun, Nouv. Archiv. du Museum (4), VII., 1905, p. 241. 



This species, described by de Man from the Upper Irrawaddy, differs from 

 P. fungoswm only in the following particulars : — 



The carapace is flatter, but the broad corrugations of the epibranchial 

 regions are stronger and more tumid. 



The antero-lateral margins of the carapace are cut into three teeth, 

 exclusive of the outer orbital tooth, and the foremost one of these is broad 

 and blunt. 



The post-orbital crests are even shorter, being reduced to a small tubercle 

 lying behind the inner angle of either orbit. 



The gap between the lower margin of the orbit and the outer orbital tooth 

 is less distinct. 



In females which seem to be adult the chelipeds may be subequal. In the 

 male the fingers of the enlarged cheliped are not quite as long as the palm. 



The carapace of an adult male is liths inch long, ilths inch broad, and 

 fVths inch deep. 



^'^--. Suddea, Assam. F. Day. 2 ? . 



4r 



--— . Hill stream near Harmutti. H. H. Godwin- Austen. 1 ? . 



^^^. DaHa Hills. H. H. Godwin- Austen. \$. 



39. PoTAMON (Acanthotelphusa) crenuliferum, Wood-Mason. (Fig. 13.) 



Paratelphusa crenuUfera, Wood-Mason, P. A. S. B., 1875, p. 231 ; and Ann. Mag. Nat. Hist. (4), XVIII., 

 1876, pp. 121, 122. 



Pohtmon (Paratelphusa) crenulifer, Mary J. Rathbun, Nouv. Archiv. du Museum (4), VII., 1905, p. 261, pi. 

 xii., fig. 11 (uhi lit.). 



Cai'apace squarish, little convex, its surface smooth, but finely pitted and 

 uniformly and minutely granular under a lens ; its length over four-fifths its 

 greatest breadth, its depth less than half its length. 



Cervical groove well graven only where it defines the mesogastric area, 

 elsewhere broad and very superficial. All the regions are indicated, but rather 



