1875.] W. Theobald — On Indian and Burmese Species of Trionyx. 175 



argued were never seen in Gangeticus, but this view I consider Dr. Gray has 

 entirely demolished, as I have already explained. 



That the figure of liurum really represents one of the many varieties 

 of Gangeticus, is rendered pretty certain, by the character of the black 

 lines on the head, which in ocellatus or sewaare is uniform, or at most darker 

 mottled, and not marked by thick lines, as in the figure of liurum, neither is 

 there present the characteristic band across the snout, or the temporal 

 blotches. The head of the specimen figured as hurum seems to have been a 

 uniform and unusually pale 3 r ellowish colour or greenish yellow, but the style 

 of marking by thick black lines decides it to belong to Gangeticus. 



Skull and face of ocellatus more elongate than in Gangeticus. Mandible 

 almost spatulate in front, with a well defined median groove or furrow (f. P. 

 IV) inside. Young handsomely ocellated and the shell reticulately marbled 

 with darker. A conspicuous yellow bar across the nose, and a large yellow 

 spot on either temple, and a smaller one at the gape. General colour green, 

 darker on the occiput, where it is mottled with paler. Throat and neck 

 plumbeous white. Eyelids red (Jide A. Anderson in Hit.). Cartilaginous 

 portion of carapace almost devoid of tubercles in half grown and adult spe- 

 cimens. Pittings of sternum coarser than in Gangeticus, and the abdominal 

 plates more bent, I think, than in that species. 



Sab. — The Ganges Valley. The specimen (figured one-third the natural 

 size) was procured by Mr. A. Anderson, at Futtehgurh. The skull is figured 

 of the natural siza» 



T. Phayrei, Theobald. PI. IV. 

 T. Phayrei, Theob., P. A. S. B. 1874, p. 75. 

 T. cariniferus, Gray (1. c.) Journ. Lin. Soc. Lond., Vol. X. 



In my paper in the Proceedings (1. c.) I referred with doubt the pre- 

 sent species to T. cariniferus, Gray, believing it to be identical with the 

 figure in the Cat. S. E. p. G7, PL XXXII. As, however, the correctness of 

 this surmise cannot well be verified and as Phayrei certainly differs from 

 the specimens described under Gray's name, in the Sup. Cat. S. E. p. 101, 

 and from the skull of Aspilus cariniferus figured on page 102, my name must 

 stand for this species. 



The colouration of the head- of Phayrei is marked and peculiar. The 

 head is pale coloured with elegant and symmetrical subreniform marblings 

 of a darker colour, arranged regularly and occupying about an equal area 

 with the ground colour whereon they are displayed. T. cariniferus, Gray, 

 however, is described as being marked on the head and neck with white 

 spots, in a fashion which the present species could display at no phase of its 

 growth. 



llab. — Arakan, Pegu, and the Malayan Peninsula. 



