There are the forehead covered with hair and the horns of a Muntjack in the collection sent by M. Mouhot from Cambodia: it is very much larger than any specimen of that genus in the British Museum collection, and is probably a distinct species. The horns are thick, nearly straight, with a short, thick recurved branch on the outer part of the front side, near the base, and one of them has a somewhat similar callosity on the hinder side on the same level. Hair of forehead very rigid, close pressed, dark brown, with narrow yellow rings. (Gray, Proc. Zool. Soc., 1861, p. 138.) LIST OF THE NEW SPECIES OF REPTILES DISCOVERED BY THE LATE M. MOUHOT IN SIAM AND CAMBODIA. BY DR. ALBERT GÜNTHER. _a._ TORTOISES. 1. _Geoclemys macrocephala._ REPTILES. The shell oblong, rather depressed, entirely three-keeled, olive-brown: the keels subcontinued, nearly parallel; the middle one higher and more distinct behind; the lateral ones, near the upper edge of the shields, continued, ending abruptly on the hinder edge of the third lateral discal shield: the hinder lateral and central shield only marked with a slight convexity: the margin entire, yellow edged: the under side yellow, with black triangular spots: the sternum flat, very indistinctly keeled on the side. Animal black olive, head large; crown flat, covered with a single smooth plate, purplish-brown, with two streaks from middle of the nose; the upper edging the crown, the other the upper part of the beak, and with two streaks from the hinder edge of the orbit; the lower short and interrupted, extended on the temple; the upper broader and continued over the ear, along the side of the neck; two close streaks under the nostrils to the middle of the upper jaw, and two broad streaks dilated behind, down the front of the lower jaw, and continued on the edge of the lower jaw behind: the nape and hinder part of the side of the lower jaw covered with large flat scales: the rest of the neck and legs covered with minute granular scales: the front of the forelegs covered with broad band-like scales: the toes of the fore and hind feet rather short and thick, covered above with broad band-like scales. (Gray, Proc. Zool. Soc., 1859, p. 479, pl. 21.) 2. _Cyclemys Mouhotii._ Shell oblong, pale yellow; back flattened above, with a dark-edged keel on each side: the vertebral plates continuously keeled, and rather tubercular in front: the margin strongly dentated: nuchal shield distinct. (Gray, Ann. and Mag. Nat. Hist., 1862, x. p. 157; Günth., Rept. Brit. Ind., pl. 4, fig. D.) 3. _Trionyx ornatus._