] 10 Zoological Society, 



Cistudo dentata (adult), Gray, P. Z. S. 1856, p. 183 ; Bell, Tes- 

 tudinata, t. (with animal) 1 



Hub. 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 front 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 



