A fragment of a ?dentary bone, fractured behind through the socket for the third tooth. The sockets are nearly circular. It measures about an inch long,, and behind the socket for the second tooth 1-3/4 inch high. The sides of the jaw are gently concave from above downward, having a pinched aspect and approximating; they round into a narrow rostral ridge, which widens towards the tip of the snout and is truncated by a small sub-circular [or sub-pentagonal] rugose area at right angles with the part of the palate behind the first pair of sockets. The first pair of sockets are nearly as large as the second, and from the steep incline of the jaw look more than usually upward; they are 7/16ths of an inch long, are separated from each other by an interspace of 6/16 ths, and from the second sockets by an interspace of more than 1/8th of an inch, while the second socket is separated from the third by about 1/4th of an inch. The palatal space between the second pair is about 3/4ths of an inch. XXI. Ornithocheirus colorhinus (Seeley). Case. Comp. Tablet. Specimen. =J= _c_ 17 1, 2 Fragments of premaxillary bones. The largest portion is 2-1/2 inches long, and is fractured behind the socket for the fourth tooth, and the upper part of the nose is also broken away. The palate is flattened, with the median part slightly convex. The sides of the jaw converge upward, but not rapidly; in front they round into each other, but there is a slight mesial depression. The front pair of teeth are large, separated from each other and from the second pair by films of bone. Above the first pair of sockets, so as to look downward and forward, is an impressed lunate area 9/16ths of an inch wide and 5/16ths of an inch high, to which a soft lip may have been attached. This area is in the same plane with the first pair of teeth and at right angles with the upper outline of the nose. The sockets of the first pair of teeth are a little smaller than the second pair; they are both about half an inch in diameter and nearly circular. An interspace of 3/16ths of an inch separates the second socket from the third. The tooth is elliptical, the socket being narrower and longer than that of the second. The palatal interspace between the third pair is more than 3/4ths of an inch. The interspace between the third and fourth sockets is about 3/8ths of an inch. The diameter of the nearly circular fourth socket is 1/4th of an inch. The overhanging lunate lip space, with the size of the teeth and width of the palate, abundantly distinguish this species. XXII. Ornithocheirus woodwardi (Owen). Case. Comp. Tablet. Specimen. =J= _c_ 18 1-4