| Case. | Comp. | Tablet. |
| J | c | 25 |
Ornithocheirus enchorhynchus (Seeley).
This species nearly resembles O. brachyrhinus, from which it differs in larger size, with a relatively wider palate, which is without a keel, and in a larger front pair of teeth. It approximates towards O, colorhinus, but is smaller, and wants the rugose lunate area over the front pair of teeth characteristic of that species. There are many varieties or species nearly related to this type, but from their imperfect preservation and the small part of the head which they represent, it is not possible to give descriptions of them.
XX.
| Case. | Comp. | Series. | Tablet. |
| J | c3 | 16 | 1 |
Ornithocheirus eurygnathus (Seeley).
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 13/4 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.
| Case. | Comp. | Tablet. | Specimen. |
| J | c | 17 | 1, 2 |
Ornithocheirus colorhinus (Seeley).