58 dr. J. e. gray on the trionychid^e. [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 Sarbieriafrenata 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 giintheri, Gray, P. Z. S. 1862, p. 264. 



Trionyx giintheri, Giinther, 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 sur- 

 face 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. Platypeltis. 



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 pro- 

 jecting 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. Platypei.tis 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. 



Testudoferox, Pennant, Phil. Trans, xli. p. 266, t. 10. fig. 5 (copied 

 in Shaw's Zool. iii. p. 64, t. 17. fig. 1) : Gray, Cat. Sh. Rept. p. 68. 



