T he fossil obtained by the Rev. Messrs. Hislop and Hunter† from the sandstone series of Mángali, about sixty miles to the south of Nágpur, and transmitted for my examination, is a considerable portion of a skull, wanting chiefly the tympanic pedicles and the lower jaw; it is imbedded in a block of bright brick-red compact stone, with its upper surface exposed. The skull (Pl. II.) is broad, depressed, of an almost equilateral triangular form ; the occipital border or plane rather exceeding in extent each lateral border, which borders converge with a slight convex curve to the rounded obtuse muzzle. The breadth of the occiput is 4 inches 9 lines, and the extent of each lateral border of the skull in a right line is 4 inches 6 lines. Most of the cranial bones are impressed by rather coarse grooves, radiating in each from a prominence which indicates the primitive centre of ossification; the intervening ridges being in some parts broken up by communicating grooves into tubercles. The orbits ( o, o ) are entire, of a moderate size, of a full oval form, and situated in the anterior half of the skull. The middle line of the upper surface of the skull is slightly depressed; at the upper and fore part of the skull on each side, there is a smooth continuous groove of a sigmoid form, with a strong curve, convex outwards anterior to the orbit, and with a less strong curve, convex inwards on the inner side of the