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Show 58 DR. J. E. GRAY ON THE TRIONYCHlDcE. [Jan. 7, The hinder bones have some very indistinct inosculating lines on their surface, which I thought indicated that in a more perfect state they would have distinct callosities ; and I am by no means sure that this may not be the character of the genus ; and I think it very probable that the animal figured as Trionyx subplanus, which is the type of the genus Dogania, and Sarbieria frenata are the same species. The chief difference between the two specimens is that the larger one has the back edge of the odd bone slightly rugose, forming an indistinct lunate cross band, whereas the surface of this bone in the smaller specimen is quite smooth. 2. DOGANIA GUENTHERI. Dogania guntheri, Gray, P. Z. S. 1862, p. 264. Trionyx guntheri, Gunther, Rept. Brit. Ind. i. p. 49, t. 6. fig. 4. The odd bone in front of the dorsal disk not quite so distinctly separated as in the other species ; the greater part of its upper surface pitted and callous; a broad semiovate notch in the hinder margin. Inner part of the hinder edge of the lateral sternal bones rather rugose; and this is the case with the whole inner portion of the hinder lateral bone. The whole surface of the hinder pair of bones is more or less rugose, indicating, I think, that the inner part of the lateral bones, and greater part of the hinder bones, are punctate and callous in the adult, as in Trionyx. The animal from which this species is described has been dried without preparation. 8. P L A T Y P E L T I S. Platypeltis, Gray, P. Z. S. 1869, p. 214 ; Suppl. Cat. Sh. Rept. p. 107. Skull [imperfect behind] ; face tapering, rounded in front; nose-hole large, rather longer than broad, with the nasals acute and projecting above in front; space between the nose-hole and the orbits less than half the diameter of the orbit. Alveolar surface of the upper jaw moderate, gradually wider, and then of equal width its whole length, with a raised inner margin. Groove in the centre of the palate broad, rather deep, gradually broader behind, as wide as the front of the large inner nostril, and continued on the sides. Lower jaw strong; alveolar surface concave, with a sharp outer edge, broad and most concave in front, narrow and of nearly the same width to the base of the ascending rami. 1. PLATYPELTIS FEROX. (Fig. 9, p. 59.) Upper part of the head brown, with a black streak from the base of the nose to the back of the eye, and continued from the lower part of the back of the eye. Back of the dorsal disk with a longitudinal series of small spines. Testudo ferox, Pennant, Phil. Trans, xii. p. 266, t. 10. fig. 5 (copied in Shaw's Zool. iii. p. 64, t. 17. fig. 1) ; Gray, Cat. Sh. Rept. p. 68. |