( iv ) 



Family CHITRIDiE, 

 Claws three on all feet. Mandible weak. 

 Active. Carnivorous, ferocious. 



Chitra. 



Head elongate. 

 Head elongate . , , C. Indica. 



Pelochellys. 

 Head broad. 

 Muzzle short ... P. Cantorii. 



Family TRIONYCIDiE. 



Claws three on all feet. Mandible strong. 

 Active. Carnivorous, ferocious. 



Trionyx. 

 No bony plates at the margin. 



a. — No onedian ridge on mandible inside. 



Head marked with black streaks ... T. Gangeticus, 



Head with yellow bar across the snout and 



two temporal spots ... T. ocellatus. 



Head with the temporal spots but no yel- 

 low band on the snout ... T. sewaare. 



h. — A median ridge inside mandible. 

 Head yellow mottled . . . T. stellatus. 



Head dark marbled. Sternum very carti- 

 laginous ... T. Phayrei, 

 Head dark marbled. Sternum normal ... T, Grayii. 

 Head black dotted . . . T. Peguensis. 

 (Young) 4 ocelli, beneath " sooty " . . . T. formosus. 

 (Young) a saddle mark on the back ... T. ephippiura. 



Emyda. 



Margin of carapace throughout with bony plates. 

 Shell yellow spotted . . . E. granosa. 



Shell striped ... E. vittata. 



Shell plain. Odd sternal bone large ... E. scutata. 



