CHELONIA. 739 



statement regarding tlie sex of these 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 (PL Ixxv^, figs. 16 to 20) the upper sm-face of the skull 

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



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

 at once separated by its deeper premaxillary 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 JB. trimttata, and the only notable differences were, 1st, the much 

 shorter small intestine measuring only 46^'''50, and the large intestine 30 inches, 

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

 compared with the contracted gut of the specimen of JB. trimUata ; and Ind, 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 JB. 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 their close relation to this 

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

 of beins: here considered. 



-^o 



+ Batagur duvaucelli, D. & B. 



Emys dhongoJca, Gray, 111. Ind. ZooL, vol. ii, 1834, Tab. 60, fig. 3 (not described) ; Blyth, Journ. 



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

 jEky5 fk-yawc^^^i, Dum. & Bib. Erpet. Gen., vol. ii, 1835, p. 335 ; Gray, Cat. Tort. B. M., 1844, 



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

 Batagur dJiongoka, Gray, Cat. Sb. Rept., 1855, p. 36, Tab. xviii, figs. 1 to 3, juv. ; Giintber, Proc. 



Zool. Soc, 1861, p. 314; id., Eept., Brit. Ind., 1864, p. 43; Blytb, Journ. As. Soe., Bengal, 



vol. xxxii, p. 84, 1863, j^j^r*; Tbeobald, Cat. Rept. Journ. As. Soc., Bengal, vol. xxxvii, ex. No., 



1868, p. 12 ; id., Des. Cat., 1876, p. 33. 

 Kachuga JiardwicUi, Gray, Proc. Zool. Soc, Lond., 1869, p. 303. 



Clemmys dhongoJca, Sizauch, Cbelon. Stud., 1863, p. 33; id., Verth. der Scbildkr,, 1865, p. ^^,pars. 

 DhongoJca hardwicJcii, Gray, Suppl. Cat. Sb. Rept. B. M., 1870, p. 57, pars; App. Cat. Sb. Rept., 



1873, p. 18,i9ar5. 

 DhongoJca hardwicJcii, Gray, Hand-List, Sb. Rept., 1873, p. 53. 



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 



