CHELONIA. 787 



referred by Gray to T. formosm,^ as lie states under T. formosus that " this 

 may be the species indicated as a Trionyx phayrei,'' but afterwards^ he identified 

 the skull of T. phayrei with T. Imrmn of his Synopsis Eeptilium, but with which 

 T. phayrei has no affinity. In 187r I identified a skull, recognized by Theobald 

 to be the skull of his T. phayrei, with the type skuU, T. jeudi, and I stated 

 that after a comparison of the two, I could not detect any characters by which to 

 separate them, but Dr. Gray considered that I had erred, and that the turtle I described 

 as T. phayrei was distinct from T. jeudi and referable to his T. perocellatus. But, 

 as we have seen, Dr. Gray after this still identified T. phayrei with T. hurum. 

 But in the Hand List* my view of the identity of T. phayrei and T. jeudi was 

 ultimately accepted, but the species was erroneously referred to the T. sewaare, 

 which is identical with the T. hurum of the Syn. Beptilium. 



The head in alcohol which was the only specimen of the kind in the British 

 Museum obtained from Theobald has a peculiar history. In the Suppl. to the Cat. 

 Shield Rept.^ the head of an adult animal in spirit is stated, under Trionyx jeudi, 

 to have been obtained from Mr. Theobald, who procured it in Pegu, but it is 

 remarked that the symphysial ridge of the lower jaw is only slightly raised and very 

 different from the type of T. jeudi. On the following page, a head in spirit from 

 Mr. Theobald is again mentioned, and described as the type of T. peguensis. 

 There can be no doubt but that this also is the head referred to under T. jeudi. 

 The skull of this head was ultimately removed and figured by Dr. Gray,^ and the 

 prepared skull shows a large injury which is explained by Theobald, who states that 

 the two Trionyces he collected in Pegu were shot by his revolver.^ The specimen 

 which constituted the type of T. peguensis, Theobald mentions^ was taken by 

 a fish hook from the Sittang river at Tonghoo, but as both specimens were shot 

 by him, we conclude that this example was shot after it had been landed by the 

 hook. 



I shall now consider these specimens in detail, and some other Trionyces which 

 have since been figured and described by Theobald,^ in order to arrive at an under- 

 standing of their relations to the species figured in this work. I have not seen the 

 shell of the type of T. phayrei which was obtained by Theobald in a mountain stream 

 in the Arracan range, west of Pegu, but it was remarkable owing to the circumstance 

 that the roughened surfaces which generally occur on the elements of the plastron 

 of Trionyces were almost absent, the granulations being only slightly developed. 

 Theobald did not describe the coloration of his type, beyond stating that the 

 colour dming life was dark duU brown, handsomely lined as in Felochelys cantori ; 



1 Proc. Zool. Soc, 1869, p. 219, et. Suppl. Cat. Sh. Eept., 1870, p. 98. 



2 Ann. and Mag. Nat. Hist., x, 1872, p. 336. 



3 Proc. Zool. Soc, 1871, p. 154. 

 " I. c, p. 80. 



5 L c, p. 98. 



« Proc. Zool. Soc, 1873, p. 52, fig. 5. 



" Proc As. Soc, Bengal, 1874, p. 85. 



^ Obs. on Ind. and Burm. Trionyces, Cal., 1873, p. 7- 



" I. c, Proc As. Soc, Bengal, 1874 ; I. c, 1875, 



