SIWALIK AND NARBADA CHELONIA. 
41—195 
two species included in the latter section B. hasJca is distinguished by the absence of 
a vertebral keel in the adult, by its very broad 1st and short 2nd vertebral plates, as 
well as by the absence of the concavity in the profile of the hinder portion of the 
carapace. The contour of the shell of B. thurgi is totally different, and the 2nd and 
3rd vertebrals are relatively shorter. Of the species without a nuchal plate B. f ictus 
is distinguished by its short 2nd and 3rd vertebral plates, while B. affinis differs by 
the 4th vertebral plate being somewhat longer than broad, and the 1st and 2nd 
broader than long, as well as by the total absence of a vertebral keel in the adult. 
These comparisons indicate the specific distinctness of the present form from all 
the living species, and since the shape of the vertebral plates widely distinguishes it 
from B. durandi (with which alone of the preceding three Siwalik species it agrees in 
the depressed shell) it appears entitled to rank as a distinct species, for which the 
name of Batagur cautleyi is proposed. 
The affinities of this species are apparently nearer to B. affinis and B. pictus 
than to any other existing form, but the relationship does not seem so close as to 
indicate decisively that either of these species is the lineal descendant of the fossil. 
List of species of Batagur. 
The following list indicates the relations of the recent and fossil species of the 
genus : — 
A. A nuchal plate. 
a. 4:th vey'tehral plate elongated. 
1. 
B. 
KACHUGA (Gray [ex B. Ham.]). 
Recent. 
2. 
B. 
ELLiOTi, Gray. Recent. 
3. 
B. 
BAKERi, nobis. Pliocene. 
4. 
B. 
DHONGOKA, Gray {ex B. Ham.). 
Recent and {}) Pleistocene 
5. 
B. 
DURANDI, nobis. Pliocene. 
6 . 
B. 
TRiviTTATUS (Dum. and Bib.). 
Recent. 
Wb vertebral plate short. 
7. 
B. 
THURGI (Gray). Recent. 
8. 
B. 
FALCONERi, nobis. Pliocene. 
9. 
B. 
BASRA, Gra\'. Recent. 
■ B. No nuchal plate. 
10. B. CAUTLEYI, nohis. Pliocene. {Nuchal probably absent.') 
11. B. AFFINIS (Cantor). Recent. 
12. B. PICTUS (Gray). Recent. 
Genus non. det. 
{cf. Geoemyda., Gray.) 
Nuchal scute . — In plate XXIV. fig. 3, there is represented, of one-third the 
natural size, the dorsal aspect of the nuchal scute of a large emydine tortoise 
apparently distinct from all the forms described above, which was collected by Mr. 
Theobald in the Siwaliks.of the Punjab. The specimen shows the boundaries of 
the nuchal horny plate, the inner half of the 1st marginal of either side, the anterior 
K 
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