TKIONYCHID.E. O 



Ci)ttra tnfflua> Gray 1 . 

 Syn. Trionyx indicus, Gray 2 . 



The type and only known species, which is the largest repre- 

 sentative of the family, the carapace attaining a length of more 

 than three feet. 



Hah. India and Burma. 



The following specimen is from the Pleistocene of the Narbada 

 Valley, India. 



R. 1415. The imperfect proximal extremity of the second left 

 costal bone of a medium-sized individual. The species 

 is at the present day unknown in the rivers of Western 

 India. Presented by C. Eraser, Esq., 1849. 



The folloiving specimens are from the Pliocene of the SiwaliJc Rills, 

 India ; and, so far as is hnoivn, belong to the Cautley Collec- 

 tion. Presented, 1840. 



39830. The anterior extremity of the carapace of a large individual. 

 {Fig.) Described and figured by the writer in the ' Palseontologia 



Indica ' (Mem. Geol. Surv. Ind.), ser. x. vol. iii. p. 207, 

 pi. xxvii. fig. 1. The specimen shows the nuchal and the 

 first two neurals and costals. Portions of the plastron 

 are shown on the ventral aspect. 



39832. The imperfect carapace. Described and figured, op. at. 



(Fig.) p. 207, pi. xxvii. fig. 2. Shows the first six neurals (the 

 third imperfect), the first six costals of the right side, and 

 portions of those on the left. In all respects this specimen 

 accords with recent examples. 



39831. Fragment showing the fourth and fifth neurals, with the 



proximal extremities of the costals of the right side and 

 the underlying vertebrae. 



R. 884. Fragment from the dorsal region of the carapace, showing 

 the entire 3rd neural, and portions of the 2nd and 4th, 

 and of the adjacent costals and underlying vertebrae. 



R. 1416. The imperfect distal extremity of the first right costal of 

 a very large individual. 



R. 1417. The distal extremity of the second left costal of a smaller 

 individual. 



1 Synopsis Reptilium, p. 47 (1831).— Trionyx. 2 Loc. cit. 



