49 



In the largest specimen the carapace is 111 inch long, 2,v inches liroad, 

 and ifths inch deep. 



6723 



2990-^95 



10 

 5435 



10 

 5461 



10 

 5457 



To" 



5462 



10 



5477 



To" 



5479 



10 

 5539 

 TcT 

 5480 



10 

 No 

 number. 



The following specimens, which differ in having the antero-lateral borders 

 of the carapace not so strongly arched, and the anterior part of the cervical 

 groove not quite so distinct, m-ust undoubtedly be referred to this species :— 



6944 



3 

 2737 



7 

 24.30 

 "10 

 5454 

 ^0" 

 5483 

 10 

 5508 



10 

 5542 

 UT 



As far as I can make out, P. manii is the species which, in India, has 

 been called P. larnaudii. 



PoTAMON (Potamon) brevimarginatum, de Man. 



Potamon {Potamon) hrevimarffinatus, de Man, M. J. Rathbun, Nouv. Archiv. du Museum, Paris (4), VI., 

 1904, p. 277 (uhi lit.), pi. X., fig. 8. 



Differs from P. larnaudii in the following particulars : — 

 The cervical groove, which, as in larnaudii, does not cut through the post- 



