Igo Records of the Indian Museum. (VoL. XI, 
The dorsal surface of the disk is greenish black obscurely 
vermiculated and marbled with olive-green; that of the limbs and 
tailis also blackish, while that of the head is variegated with dark 
olive-green and a much paler olivaceous brown. In one specimen! 
dark green predominated on the head and the paler markings were 
not of a very definite nature, but on that of the other (fig. 1) 
there was a much larger proportion of the paler shade, a dark line 
extended backwards and downwards from each eye and there were 
two distinct forwardly-directed Y-shaped black bars on the tem- 
poral and occipital regions, interrupted somewhat at their apices 
in the middle line; the ends of the bars extended backwards more 
faintly on to the neck. 
The cartilaginous disk is long and relatively narrow, expand- 
ing slightly behind. In front of the bony carapace there is a 
conspicuous projecting pad of coarsely tuberculate cartilage, and 
Fie. 1.—Trionyx letthii, Gray. 
Head of a living specimen from the Kurnool district (x 3). 
behind there is a group of large tubercles in the central region. 
The anterior part of the carapace itselt bears a prominent rounded 
boss; there is no middorsal ridge or groove 
The disk of the larger of the two specimens is 49 cm. long and 
4I cm. broad, that of the smaller one 47 cm. X 42cm. In the 
former the breadth of the bony carapace, which is broadly 
emarginate behind, is 29 cm. and the breadth 32cm. The length 
of the skull, which agrees well with Gray’s figure of 1873 except 
that the lower jaw is not cleft at the tip, is 91 mm. and the 
zygomatic breadth 58 mm. 
Dr. Henderson’s specimens, of which the larger has been re- 
tained in the Indian Museum and the smaller returned to Madras, 
were taken by his assistant Mr. Sundara Raj in a small stream in 
_ + The snout had been injured in this specimen and possibly the dark coloura- 
tion was to some extent due to inflammation or congestion. 
