194—40 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
Batagiir dhongoka. Further materials are, however, necessary to show whether this 
supposed identification be correct.” 
Species 5. Batagur cautleyi, n. sp. nobis. 
Type specimen . — A fourth species of Siwalik Batagur is indicated by a fairly 
perfect shell in the British Museum, obtained from the Siwalik Hills, and presented 
to the Museum by Dr. Falconer; this specimen is figured of one-sixth the natural 
size in plate XXIV. figs. 1. la. Superiorly it shows the boundaries between the 
plates, but the sutures between the underlying scutes are only partially visible ; the 
plastron shows neither the boundaries of the plates nor the sutures between the 
scutes, and has not, therefore, been figured ; the specimen is broken off posteriorly 
at the hinder part of the 5th vertebral plate. When complete the length of the 
shell must have been about 25 inches ; and it is of very considerably larger 
dimensions than the adult shells of either of the three preceding Siwalik species. 
It is readily distinguished from B. falconeri and B. haheri by its extremely depressed 
form, the gentle ascent of the profile of the anterior portion, and the concave profile 
of the posterior extremity ; in its depressed form it agrees with B. durandi^ but is 
otherwise very distinct. 
The shell is highest slightly in advance of its middle point. The 1st vertebral 
plate makes an approach to a bell-shape, being somewhat narrower before than 
behind ; it is longer than broad, and is considerably shorter than the 2nd. Both the 
2nd and 3rd vertebrals are elongate, but the latter is much longer than the former. 
The 4th vertebral is much shorter than the 3rd, and is of nearly equal breadth at 
the line of junction ; it is hexagonal in shape, and its breadth and length are nearly 
equal. There is a very distinct interrupted vertebral keel, the prominences of which 
do not coincide with the posterior terminations of the vertebral plates. The relation 
of the 3rd vertebral plate to the underlying scutes^ is the same as that obtaining in 
B. tliurgi and B. basJca, and probably in B. affinis. There is no trace of any nuchal 
plate. 
Second specimen. — The shell of a large Batagur from the Siwalik Hills in the 
Indian Museum (No. E 178)^ agrees, as far as the writer can recollect, in general 
contour with the preceding specimen, and may not improbably, therefore, belong to 
the same species. 
Distinctness and abilities. — The shortness of the 4th vertebral plate, and the 
relations of the 3rd vertebral plate to the underlying scutes distinguishes the present 
form from the species ranged in section a of group A in the table on page 187 ; and 
as the nuchal plate appears to have been absent its affinities are probably with group 
B, rather than with section h of group A. It may, however, be observed that of the 
1 Vide supra, ■p. 191. 
2 On account of the excessive weight of this specimen its transport to England was deemed inadvisable. For the same 
reason another specimen in the Indian Museum (No. E 176) from the Siwaliks of the Rurki district was not sent. The latter 
has a highly vaulted carapace, and may perhaps belong to B. hakeri. 
