248 TRIONTCHIDJ;:. 



/. Yg., spir. Borneo. (Type of T. dilhvyni.) 



(J. Yg., spir., skull ? (Type of T.fmmUis.) 



separate. 



h. Ilgr., stffd. ? East India Comp. [P.]. _ 



(T}^e of T. (juentheri.) 



2. Trion3rx gangeticus. 



Trionyx gangeticus, Cur. Oss. Fans. v. pt. 2, p. 180, pi. xi. figs. 5-8 



(1824) ; Anders. Ann. 3,- Mag. N. H. (4) ix. p. 382 (1872) ; Graij, 



Ann. ^- Mac/. N. H. (4) x. p. 333 (1872) ; Tiieob. Froc. As. Soc. 



Bcng. 1874, p. 77. 

 Aspidoueetes gangeticus, Wagl. Syst. Amph. pi. ii. figs, xiii.-xviii. 



(1830). 

 Trionyx javanicus {non Geoffr^, Gray, Syn. Rept. p. 48 (1831), and 



111. Ind. Zool. ii. pi. ixv. (1834) ; Giinth. Rept. Brit. Lid. p. 48 



(1864). 

 Gynmopus duvaucelii, part., Dinn. S,- Bihr. ii. p. 487 (1835). 

 Tyrse javanica, part., Gray, Cat. Tort. p. 47 ( 1S44). 

 Potamocbelvs stellata, part., Gray, Froc. Zool. Soc. 1864, p. 85, and 



Suppl. Celt. Sh. Bcpt. i. p. 104 (1870). 

 Trionyx gangeticus, part.. Gray, Cat. Sh. Rept. i. p. 66, pi. xlii. fig. 1 



(1855), and Suppl. p. 97, atid Froc. Zool. Soc. 1873, p. 47; Theoh. 



Froc. As. Soc. Beny. 1875, p. 171, and Cat. Rept. Brit. Ind. p. 28. 



(1876). _ 



javanicus, part., Gray, Cat. Sh. Rept. i. p. 67. 



Aspilus gatagliol, Gray, Ann. ^- Mag. N. H. (4) x. p. 339 (1872), and 



Froc. Zool. Soc. 1873, p. 67. 



Costal plates eight pairs, the last well developed and in contact 

 throughout on the median line ; two neurals between the first pair 

 of costals ; plates coarsely pitted and vormiculate. Epiplastra 

 narrowly separated from each other in front of the eutoplastron, 

 which forms an obtuse or a right angle ; plastral callosities very 

 large, hj'o-hypoplastral, xiphiplastral, and, in old specimens, ento- 

 plastral. Dorsal skin of young with longitudinal ridges of small 

 tubercles. Head moderate ; snout (on the skull) about as long as 

 the diameter of the orbit ; intcrorbital region, in the adult, consi- 

 derably narrower than the nasal fossa : postorbital arch one third 

 to one half the greatest diameter of the orbit ; mandible with the 

 inner edge strongly raised, forming a sharp ridge, which sends off 

 a short perpendicular process at the symphysis ; the diameter of the 

 mandible at the symphysis does not exceed the diameter of the 

 orbit. Olive above ; back of young vermiculated with fine black 

 Unes, but without ocelli ; head with a black longitudinal streak from 

 between the eyes to the nape, intersected by two or three y^-shaped 

 black streaks ; lower parts yellowish. 



Length of dorsal disk 66 centim. 



Calcutta. 



Sultanpoor. Capt. Boyes [P.' 



India. Capt. Boyes [P. 



India. Prof. Oldham [P.]. 



