CHELONIA. 739 



statement regarding the sex of tliese skulls was probably correct. The aural orifice 

 also of the female skulls is not so round as in the male skull. These are the only 

 differences which suggest themselves after a very careful examination of the adults. 



In the young male (PI. Ixxv^, figs. 16 to 20) the upper surface of the skuU 

 is nearly flat, but its other features are the same as in. the females. 



The skuU closely resembles the skull of B. lineata, from which, however, it is 

 at once separated by its deeper premaxiUary notch ; the feebler serration of the 

 maxillary ; the much more concave character of its under surface ; the much 

 less downward arching of its palate, and especially by the antero-posteriorly broad 

 plate behind the single palatal ridge. Superiorly the skulls are very much alike. 



As stated in the definition of the genus, the eyes of this as of other species are 

 strengthened, as in birds, by a ring of bones in the sclerotic. 



The viscera of the large female were compared carefully with those of the 

 adult male of B. trivittata, and the only notable differences were, \st, the much 

 shorter small intestine measuring only 4i6''''"50, and the large intestine 30 inches, 

 although the intestinal tube, in the individual examined, was very soft and fla,ccid 

 compared with the contracted gut of the specimen of B. trivittata ; and 2nd, the 

 much smaller ear-shaped processes of the lung, lying free in the visceral cavity, 

 compared with the large processes of B. trivittata. The cloacal bladders had much 

 the same character as in B. trivittata, 



I have received examples of this species from Pegu and from Bhamo in Upper 

 Burma, so that it appears to be generally distributed throughout the Irawady. 



I propose here to consider two other allied species which do not belong to the 

 fauna of the Irawady and its affluents, but which from thek close relation to this 

 and the foregoing species, and the little that is known regarding them, are worthy 

 of being here considered. 



+ BATAGUR DTTVAirCELLI, D. & B. 



Emys dhongoka, Gray, 111. Ind. Zool., vol. ii, 1834, Tab. 60, fig. 2 (not described) ; Blytb, Journ. 



As. Soc, vol. xxiii, p. 210, 1854. 

 Emys duvauceUi, Dum. & Bib. Erpet. Gen., vol. ii, 1835, p. 335 ; Gray, Cat. Tort. B. M., 1844, 



p. 15 ; Dumeril, Cat. Metb. Eept., 1851, p. 14. 

 Batagur dhongoJca, Gray, Cat. Sh. Kept., 1855, p. 36, Tab. xviii, figs. 1 to 3, juv. ; Giintber, Proc. 



Zool. Soc, 1861, p. 214; id., Kept., Brit. Ind., 1864, p. 42; Blytb, Journ. As. Soc, Bengal, 



vol.xxxii, p. 84, 1S63, pars; Tbeobald, Cat. Kept. Joui-n. As. Soc, Bengal, vol. xxxvii, ex. No., 



1868, p. 12; id., Des. Cat., 1876, p. 22. 

 Kacluga hardtmcUi, Gray, Proc. Zool. Soc, Lond., 1869, p. 202. 



Clemmys dhongola, Strauch, Cbelon. Stud., 1862, p. 33; id., Vertb. der Scbildkr., 1865, p. %%,pars. 

 Dlongola hardwicUi, Gray, Suppl. Cat. Sb. Kept. B. M., 1870, p. 57, pars; App. Cat. Sb. Kept., 



1872, p. 12,, pars. 

 Dhongola hardwickii, Gray, Hand-List, Sb. Kept., 1873, p. 52. 



The shell is oval and more pointed posteriorly than anteriorly, attaining its 

 greatest expansion about the seventh marginal, with its posterior portion depressed, 

 with a depression sometimes over the region of the fourth vertebral, or continued 



