O CHEL0XIA . 



Crtonur gangcttcus, Cuvier \ 



Of large size, with the sculpture coarsely vermiculate, and the 

 plastral callosities very large. Skull (fig. 2) with a short and blunt 

 muzzle, the interorbital bar in the adult narrower than the narial 

 aperture, and the mandibular symphysis short. Hypoplastrals large 

 and flattened. 



Hab. India. 



At the present day the species is known only from the Ganges valley. 



Pig. 2. 



Trionyx gangcticus. — Frontal aspect of the cranium ; from the Pleistocene of 

 the Narbada Valley. About ^. step, supraoccipital ; par, parietal ; pt.f, 

 postfrontal ; fr, frontal; pr.f, prefrontal; mx, maxilla; ju, jugal, q.j, 

 quadrat ojugal ; or, orbit. The bone on either side of the supraoccipital 

 is the opisthotic, externally to which is the squamosal.^ (From the ' Eec. 

 Geol. Surv. Ind.') 



39843. The cranium, imperfect posteriorly; from the Pleistocene 

 (Fig.) of the Narbada Valley. Described and figured by the 

 writer in the ' Palceontologia Indica ' (Mem. Geol. Surv. 

 Ind.), ser. x. vol. iii. p. 204, pi. xxv. fig. 3, and also in 

 the ' Eec. Geol. Surv. Ind.' vol. xxii. p. 56 , from which 

 the accompanying woodcut is reproduced. This specimen 

 agrees in all respects with recent crania. 



Presented bg C. Fraser, Esq., 1849. 



1 ' Ossemens Fossiles,' 2nd ed. vol. v. pt. ii, p. 186 (ISl-M). 



