614 Catalogue of Reptiles inhabiting the [July, 



Two were at different times found in fishing stakes placed along the 

 sea-shore of Pinang ; a third was also taken out of the sea with a small 

 hook, baited with a shrimp. The Malays assert that this tortoise also 

 inhabits estuaries and rivers on the Peninsula, and that it grows to a 

 considerable size. The young is very timid, withdrawing'the head and 

 extremities when touched, and thus it remained immoveable while a 

 sketch was taken. 



From the description of the young of Tetraonyx lessonii, Dum. 

 and Bibr. given in Erpetologie Generate, Tome 2, p. 338, and from 

 the plates of Emys batagur and E?nys baska, in Illustr. Ltd. Zool., 

 from B. Hamilton's MSS., the present appears to differ in too 

 many particulars, to warrant the conclusion of its being the young of 

 those or that species.* The detailed description of the young will 

 enable future observers, who may succeed in examining the adult, 

 finally to decide the question. 



FAM. POTAMIDA, OR RIVER-TORTOISES, Bum. and Bibr. 

 Gen. Gymnopus, Bum. and Bibr. 



(Trionyx, Geoffroy. — Aspidonectes, Wagler. — Tyrse, Bogania, Chitra, 



Gray.) 



Shell cartilaginous in its circumference, very broad, flexible behind, 

 and externally not bony ; sternum too narrow behind completely to 

 cover the extremities, when the animal withdraws them under the shell. 



Gymnopus gangeticus, (Cuvier.) 



Syn. — Testudo ocellatus, (Young.) "I 



Testudo hurum, > Buchan. Ham. MSS. 



Testudo chim, (Adult.) J 



Trionyx gangeticus, Cuvier. 



Trionyx hurum, Gray. 



Trionyx hurum, Illust. Ind. Zool. 



Trionyx ocellatus, Illust. Ind. Zool. (Young.) 



Trionyx gangeticus, Var, Guerin. (Young.) 



Gymnopus ocellatus, Dum. and Bibr. (Young.) 



Gymnopus duvaucellii, Dum. and Bibr. 



Tyrse gangetica, Gray: Catal. 



Young. — (Testudo ocellatus, B. Ham. MSS.) Head above pale 

 olive with one large yellow spot between the eyes and a similar behind 



* M. M. Dumeril and Bibron describe them as two distinct species ; Mr. Gray is of 

 opinion that they are identical. 



