84 Dr. J. E. Gray on Trionyx Pliayrei. 



for 1868 (vol. x. p. 18), named after him a species of Trionyx^ 

 thus : — 



" Trionyx Pliayrei ^ Theobald. 



" Capite typico, facial! forma forsan rotundiore. Stenu sculptura 

 modica, eive reticulationibus minoribus quam in T. fjaiujetico. 

 Sculptura ad latus regularitcr reticulata, sed vertebraU rcgioue 

 post secundas costas parum dilatata sive incrassata. Thorace 

 valde cartilagineo, vix ullis (praeter ad latus) tuberculis osseis 

 armato. Colore supra olivaceo, lineis fuscis eleganter marmo- 

 rato, subter flavescente pallido. 



" Habitat in fluminibus montium Arakanensium, prope Bassein." 



The Latin appears to bo a translation of the following ob- 

 servations : — 



" Granulation of sternum not very coarse, less so than iu 

 T. ganyeticus, on the sides regular, but coarser and larger 

 along the centre of the back behind the second pair of ribs. 

 Thorax highly cartilaginous, and almost devoid of bony callo- 

 sities save at the margin, where the granulations are slightly 

 developed. Colour during life dark dull brown, handsomely 

 lined, as in Gimther's figure, /. c. ; below yellowish white. 

 Captured in a hill-stream on the Arakan hills in the Bassein 

 district." 



It is curious that in both these descriptions 'My. Theobald 

 has mistaken the thorax for the sternum, and the sternum for 

 the thorax ; unless this is so, these descriptions are not intelli- 

 gible or consistent wnth the following observations : — 



" This is a somewhat abeiTant species in some respects, and 

 was at first confounded by me with CJiitra indica of Giinther's 

 Monograph, from the precise resemblance which the marbling 

 of the upper part bore to that figure. Since, however, examin- 

 ing the specimens in the British Museum, I find that the ani- 

 mals are very different. The true Chitra of Gray (Proc. 

 Zool. Soc. Feb. 23, 1864, p. 17) docs not, to my knowledge, 

 occur in Birma. The Chitra indica figured in Giinther's 

 monograph is, on the authority of Dr. Gray, his Pelochelys 

 Cantori. The skull of the present species cannot readily be 

 distinguished from that of T. ganyeticus, though to my 

 view it seems more arched, and rounded in profile. Tiie 

 thorax resembles that of T. yangetiais ; but the sternum pre- 

 sents a remarkable difference in the development of the bony 

 plutes^ and more nearly, in general characters, approaches 

 to Dogania subi)lana. Gray. The osseous tubercular surface^ 

 hoivever, is less developed and more feebly sculjttured (the age 

 and size of the specimen considered) than in any of its allies, 

 and at a glance servos to discriminate the present species from 

 them. 



