( 9 ) 



Gray is wholly in error in his repeated assertions that the 

 transverse sternal hinge is most mobile in the young, and that 

 " the lobes are only moveable in the young state." — P. Z. S., May 

 12, 1863. The exact contrary of this is what really takes place. 

 The oldest name is Buchanan Hamiltons Mss. Dhor, suppressed 

 by Gray when copying B. Hamilton's figure, but adopted in his 

 Supplement, Catalogue Shield Reptiles, page 23, where, with 

 reference to the transverse pseudo-hinge of the sternum, he 

 indulges in an imaginative record of a conversation between us 

 on the subject. What I really endeavoured to convey, in a 

 deferential manner, was, that inasmuch as I had convinced 

 myself, as a matter of fact, by the examination of fresh and 

 living specimens, of the correctness of what I asserted, the ques- 

 tion of fact was, as far as I was concerned, beyond the pale of 

 argument, not because I was afraid of being convinced by Dr. 

 Gray, but because I knew myself to be in a position to correct 

 hhn. I may add that in Giinther's figure of the adult and 

 aged C. Oldhami, the pseudo-hinge is indicated by a line along 

 the sternum, and my assertion has besides received full corro- 

 boration by Dr. Anderson — see Proc. Zoo. Soc, 1872, p. 371. 



A specimen of Cyclemys is recorded by Jerdon from the 

 Sylhet district. 15| inches long in a straight line, but the species 

 is not stated — vide Proc. As. Soc, Bengal, March 1870, p. 68. 



Pyxidea, Gray. 



Shell much as in Cyclem3'^s, with a lateral cartilaginous suture, 

 but no transverse sternal hinge. 



P. Mouhotii, Gray. An. and Mag., N. H., 1862, p. 157. 



Nuchal plate much broader than long. Shell moderately 

 elevated, with three strong longitudinal ridges, with rather flat 

 interspaces. Anterior and posterior margins serrated. 



Lateral ridges nearer the vertebral ridge than to the margin. 



Colour yellowish, browner on the sides. 



GUnther remarks, " in a half-grown specimen the anterior lobe 

 of the sternum appears to be slightly moveable, whilst it is 

 entirely immoveable in the larger sj)ecimens." 



B 



