It is a clearly marked species, as well distinguished from O. Fittoni by the closeness of its teeth, as O. Sedgwicki is from O. Cuvieri.
XVI.
| Case. | Comp. | Series. | Tablet. |
| J | c5 | 28 | 1 |
Ornithocheirus denticulatus (Seeley).
This is a species which can only be confounded with O. polyodon. It is a fragment of premaxillary bone 13/4 inch long, fractured through the seventh socket. It differs from O. polyodon in having larger teeth, which are wider apart, look more downward, have a narrower palatal interspace between each pair, and a rostral keel, which is more compressed from side to side behind and from above downward in front, and makes a greater angle with the palate.
The sockets are more uniform in size and closer together than usual, the second and third pairs being but slightly larger than the others; all are broadly elliptical. The palatal keel becomes sharp and prominent behind the fourth sockets. Behind the second pair of sockets the height of the jaw is nearly 7/16ths of an inch, behind the fourth sockets the height is 10/16ths of an inch; the distance between these points is about 10/16ths of an inch.
XVII.
| Case. | Comp. | Series. | Tablet. |
| J | c1 | 2 | 2 |
Ornithocheirus crassidens (Seeley).