158 Records of the Indian Museum. 
881 (32 d. A. < 
882 (32 e. A. S. 
883.(32 fA. 
884 (32 g. A. S. 
1084-6 (skull 
16750-1 (sk. 
— Dn 
~— 
Calcutta. 
9) 
Probably from 
Khulna Dist. 
UNITED PROVINCES. 
| Vor. VET, 
E. Blyth, Esq. 
+) 
Dr. N. nanan & 
B.L. Chaudhuri, Esq. 
I8Io (carapace): jttv. Allahabad. E, Atkinson, Esq. 
1729 (stuffed) a3 J. Cockburn, Esq. 
468 (spirit) 3 xe 
285A. ssoy) ,» ” 
286 (head in spirit) e 
756 (skull) : : 
1732 (stuffed) Agra ? Dr. Stoliczka. 
L727 ae Agta. 
72S as ite, 5 Riddell Museum, 
Agra. 
SIND. 
1835-6 (skulls) R. Indus, Karachi Museum. 
Karachi. 
3869, 3871-2 (heads in ss ae 
spirit) 
Very old individuals lose the characteristic markings to a 
greater or less extent, sometimes becoming of an almost uniform 
pale olive-green all over the dorsal surface of the head and body. 
The ventral surface is never dark. ‘The iris varies in colour 
from emerald-green to golden yellow. 
The bony carapace of the largest specimen I have seen 
measures 48°5 cm. in length by 53°4 cm. in breadth. So far 
as I am aware, there are always two neural plates between the 
first pair of costals. The presence or absence of a callosity on 
the entoplastron is not correlated, either in this species or in 
T. nigricans, with age or sex. In some small individuals it 
is present, while in other much larger and evidently older ones no 
trace of itcan befound. ‘The median projection of the hyoplastra,! 
except in very young individuals, is double and comparatively 
short and stout, disappearing altogether in very large specimens, 
in which the two hyoplastra are in contact or almost in contact in 
the middle line for the greater part of their length. The sculpture 
on the sternal callosities is very deep and strong. The skull 
becomes much broader and blunter with age. The hypobranchials 
(fig. 1) are long and comparatively slender. In old individuals 
they are followed at the distal end by four or five short flattened 
oval bones, but in the young these are represented by cartilage. 
1 Cf. Siebenrock, S. B. K. Akad., Wiss. Wien, CXI, p. 280, fig. 3. 
