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forms with elevated shell of which " tectum " is the type prepon- 

 derate as we go east, whilst the depressed form of the " tentoria " 

 type replaces the others to the west, e.g. 



P. tectum. Bell. 



P. intermedia, W. Blanford. 



F. Sylhetensis, Jerdon. 



P. ventricosa, Gray. 

 These forms attain their largest size to the eastward, the Syl- 

 het form reaching to 8 inches, whilst in Bengal 7 inches is a 

 large size for a typical " tectum " to attain, whilst at Allahabad 

 specimens of that size are never seen. 



P. flaviventer, Giinther. 

 This species grows to 11 inches, and occupies a central position 

 about Allahabad. It is the largest of all the " pangshures," and 

 the plates of the thorax are subject to great variation. 



P. tentoria, Gray. 



P. Smithii, Gunther. 

 These are flat depressed forms ranging from the westerly parts 

 of the Ganges to the Indus, where they replace the " tectum " 

 type. Neither would seem to exceed 8J inches. 



MOKENIA, Gray. 

 Small sized Bataguroids, distinguished by an ocellated pattern 

 of ornamentation ; and of a restricted geographical range. 

 M. Berdmorei, Blyth. J. A. S., B., 1858, p. 281. 

 Emys ocdlata, D. et B., Blyth. J. A. S., B., 1853, p. 645, 



1855, p. 481. 

 Batagur ocellata. D. et B., Gray. Ann. Mag., N. H., 1857, 



p. 348. 

 Batagur Berdmorei, Blyth. Theobald, J. A. S., B., 1868, 

 extra No., p. 12. 

 Nuchal plate oblong. First four vertebrals sqjfiarish, sub-equal, 

 and slightly keeled. Second and third largest, broader than long. 

 Shell high, round, and smooth, the reticulated pattern of the bones 

 beneath, showing through the excessively thin epidermis. Ster- 

 num flat, obtusely but distinctly keeled, the outward shelving 



c 



