SIWALIK AND NARBADA CHELONIA. 
25—179 
Larger specimen. — The larger specimen is represented of one-third the natural 
size in plate XXI. figs. 3. 3a. It shows the whole of the carapace and plastron ; 
almost the only injuries it has sustained being the loss of part of the anterior and 
posterior margins of the carapace. The plastron is of the elongate emydine form, 
with deeply notched xiphiplastrals : it was originally flat, but from the effect of 
crushing the median line has become depressed : only the boundaries of the gular, 
abdominal, and postabdominal plates are distinctly defined. The carapace is 
convex, oblong-ov'ate, with three interrupted longitudinal keels, the bone underlying 
each vertebral and costal plate being raised into a nodose prominence. The line 
dividing the two pygal plates is distinct. The nuchal plate is broad and triangular ; 
the 1st vertebral longer than broad, and narrowest anteriorly ; the 4th vertebral and 
the 1st costal relatively wide. The anterior margin of the carapace is entire, but 
the posterior is deeply serrated : the shell is broadest across the second costal ; the 
profile anteriorly being convex. 
As the sutures of the bony scutes are visible it may be well to observe that the 
1st vertebral scute is oblong and impressed by the suture between the 1st and 2nd 
plates : the 2nd scute is broader than long ; the 3rd longer than broad, narrowest 
posteriorly, and marked by the suture between the 2nd and 3rd plates ; the 4th 
scute is nearly square ; the 5th and 6th broader than long, the former being marked 
by the division between the 3rd and 4th plates ; the 7th scute is subtriangular, and 
impressed by the suture between the 4th and 5th plates ; while the 8th scute is also 
triangular, with its apex directed forwards. 
Smaller specimen. — The smaller specimen is represented of two-thirds the natural 
size in plate XXI. figs. 1. la. lb. The plastron has lost its xipliiplastral poidion, but 
is otherwise perfect ; although as in the larger specimen it has been crushed in along 
the median line : it exhibits very clearly the complete bony union with the carapace. 
The carapace is broken off posteriorly through the middle of the 4th vertebral plate ; 
and as it agrees so exactly with that of the laj'ger specimen it may be safely referred 
to the same species, and needs no further description. 
Distinctness and affinities.- — That the two specimens under consideration are 
emydines there is no doubt, and their general resemblance to Glemmys hamiltoni is so 
close that they may be pretty safely referred to the same genus^ ; and their 
differences from the living form may now be pointed out. The largest specimen of C. 
hamiltoni mentioned by Dr. Giintheff measures 5^ inches in length, but there are 
larger specimens in the Indian Museum, Calcutta, and the writer is indebted to Mr. 
Theobald for the opportunity of comparing an unusually fine specimen with the 
fossils. The following table shows the dimensions of this specimen and those of the 
fossils : — 
1 Geofmyda tricariiieta, Blyth {vide Theobald, “Catalogue of Eeptiles of British India,’ p. 6), of which there are no 
specimens in England, is three-keeled, but the keels are apparently continuous, the shell is broadest across the fourth costals, 
has a narrow nuchal plate, and seems to resemble Clemmys. tnjuya in general shape. The male has a concave plastron. 
“ lieptiles of British India,’’ p. 32. 
