110 Zoological Society. 
Cistudo dentata (adult), Gray, P. Z. S. 1856, p. 183; Bell, Tes- 
tudinata, t. (with animal) ? 
Hab. Mergui (Professor Oldham) ; Siam (M. Mouhot). 
I was formerly inclined to believe this was an adult of the former 
species ; but we have lately received a second specimen, which proves 
that it is perfectly distinct. 
3. CyCLEMYS OVATA. 
Thorax ovate, grey-brown, convex, hinder edge acutely dentated ; 
the middle of the back rather flattened, bluntly keeled in front and 
above, and acutely keeled on the shelving hinder parts; the side 
shelving, the frent slightly and the hinder part rather deeply im- 
pressed ; the upper part of the costal plates convex; the sternum 
pale grey-brown. 
Hab. Sarawak (Wallace, no. 138). 
The specimen is not in a good state; probably the animal had 
been in confinement and was out of health ; the cross suture on the 
sternum is much eroded on the edge, and the shell seems to be dis- 
coloured. 
There is a second specimen, which was presented to the British 
Museum by Sir Andrew Smith, C.B., without any habitat, which is 
perhaps a younger stage of the species; but it does not show any 
mark of the transverse suture on the sternum, and the marginal 
plates are all broad and equally so, while, in the specimen from 
Borneo, the fourth, fifth, and sixth lateral marginal plates are much 
broader than the others on each side, and ascend up into the margin 
of the costal ones; and the sides of the shell are rather more convex 
in front, and only slightly and not so deeply impressed behind. 
The shell is uniform pale brown above, and brown below, with 
regular close radiating paler rays, which are wider and more distinct 
near the margin of the shield. The areola on the vertebral shield is 
close to the hinder margin, near the upper hinder angle of the costal 
shields, and it is near but not on the hinder outer edge of the sternal 
shields. 
The dried animal is brown; the front edge of the fore legs is 
covered with irregular-sized scales. 
Mr. Bell, in his ‘Testudinata,’ gives two figures of the underside 
of the shell of his Cyclemys orbiculata ; and in his text says that he 
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