1875.] W. Theobald — On Indian and Burmese Species o/'Trionyx;. 171 



The species I propose to notice in this paper are T. Gangeticus, Cuv. ; 

 T. sewaare, Buch. Ham. ; T. ocellatus, Bueh. Ham. ; T. Pliayrei, Theob. ; 

 T. stellatus, Geoff. ; T. Peguensis, Gray ; J. Grayii, n. s.,and T. ephippium, 

 n. s. 



The most important result of the proposed rectification of the syno- 

 nymy of our Bengal species is the separation of a third species which by later 

 writers seems to have been confounded under a closely allied one, so 

 that the number of species satisfactorily known in Bengal is raised to three ; 

 and the discrimination of two new species of the genus from the Burmese 

 countries, east of the Bay of Bengal. 



T. Gangeticus, which may be regarded as the type of the genus, has 

 from its great variability of colours, no less than from the imperfect material 

 in museums, received a number of synonyms, of which the more important 

 only are here given. 



T. Gangeticus, Cuv. (E. A.) 

 T. stellatus, var. Japonicus, Schl., F. Jap. ^ 

 T. hurum, Buch. Ham. and Illus. Ind. Zool. i Gray, 

 Gymnopus Duva/icellii, D. et B. \ (Tat. Tort. 



Testudo chin, Buch. Ham. 1 Croc, and Ainphisiuenians. 



Test, ocellata, Buch. Ham. / 



Aspidonectes Indicus, Fitz., Gray., Sup. Cat. S. R. p. 97. 

 T. Javanicus, Gray (not Cuvicr), Illus. Ind. Zool. 

 Tyrse Javanicus, Gray, Cat. Tort. Croc, and Amph. p. -17. 

 T. gatajhol, Buch. Ham. {rjatayhol Gray). 



T. hurum, Buch. Ham., Anderson, A. & M. N. H. Vol. IX, p. 382 (1872). 

 Ganga Jcachim of the Bengali fishermen. 



From some reason or other, young individuals of this species would 

 seem to be rare in Calcutta, as none exist in the Indian Museum (that is 

 in a recognisable state), though adults are commonly brought to market, 

 I believe, mostly from the direction and neighbourhood of Faridpur. 

 Dr. Anderson asserts that the young are not ocellated, a statement which is 

 met by Dr. Gray, by his figuring two young specimens of typical Gange- 

 ticus, each displaying four ocelli (P. Z. S., 1873, PL VIII).. The smaller 

 specimen, a little over one inch in length, displaying four symmetrical ocelli, 

 whilst the larger one, measuring over three inches, displays the ocelli re- 

 gularly shaped, the posterior pair being elongated and divergent, very much 

 after the fashion of the spots in the figure of huntm in Buch. Hamilton's 

 drawings, whilst both possess the radiating black lines on the head peculiar 

 to the present species. 



An equally serious error to that made by Anderson respecting this 

 jpecies, is made by Dr. Gray regarding the character of the genus, where 



