YAS TRIONYCHID.&. 
Fe YR. spir. Borneo. (Type of TZ. dillwyni.) 
gy. Yo., spir., skull ce (Type of 7. frenatus.) 
separate. ; 
h. Her., stffd. —? East India Comp. [P.]. 
(Type of 7. guentheri.) 
2. Trionyx gangeticus. 
Trionyx gangeticus, Cuv. Oss. Foss. vy. pt. 2, p. 186, pl. xi. figs. 5-8 
(1824) ; Anders, Ann. § Mag. N. H. (4) ix. p. 882 (1872); Gray, 
Ann. § Mag. N. H. (4) x. p. 333 (1872); Theob. Proc, As, Soc. 
Beng. 1874, p. 77. 
Aspidonectes gangeticus, Wagl. Syst. Amph. pl. ii. figs, xili.—xviil. 
1830). 
Tae javanicus (non Geoffr.), Gray, Syn. Rept. p. 48 (1831), and 
Til. Ind. Zool. ii. pl. xv. (1834); Giinth. Rept. Brit. Ind. p. 48 
1864). 
cen duvaucelii, part., Dum. § Bibr. ii. p. 487 (1835). 
Tyrse javanica, part., Gray, Cat. Tort. p. 47 (1844). 
Potamochelys stellata, part., Gray, Proc. Zool. Soc. 1864, p. 85, and 
Suppl. Cat. Sh. Rept. i. p. 104 (1870). 
Trionyx gangeticus, part., Gray, Cat. Sh. Rept. i. p. 66, pl. xii. fig. 1 
(1855), and Suppl. p. 97, and Proc. Zool. Soc. 1878, p. 47; Theob, 
Proc. As. Soc. Beng. 1875, p. 171, and Cat. Rept. Brit. Ind. p. 28. 
1876). 
: once part., Gray, Cat. Sh. Rept. i. p. 67. 
Aspilus gataghol, Gray, Ann. § Mag. N. H. (4) x. p.389 (1872), and 
Proc. 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 vermiculate. Epiplastra 
narrowly separated from each other in front of the entoplastron, 
which forms an obtuse or a right angle; plastral callosities very 
large, hyo-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 ; interorbital 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 
lines, but without ocelli; head with a black longitudinal streak from 
between the eyes to the nape, intersected by two or three A-shaped 
black streaks ; lower parts yellowish. 
Length of dorsal disk 66 centim. 
Ganges. 
a. Ad., skel. Calcutta. 
b. Ad., skull. Sultanpoor, Capt. Boyes [P.]. 
ce. Ad., stffd., skull India. Capt. Boyes [ P. |. 
separate. 
d, Ad., skull. India. Prof. Oldham [ P.}. 
