The Medals of Creation, Volumes 1 and 2 / First Lessons in Geology and the Study of Organic Remains

by Gideon Algernon Mantell

Lign. 220. Iguanodon Mantelli. ¹/₇ nat. size.
Wealden. Tilgate Forest.
The right ramus of the Dower Jaw; [639] discovered in 1848, by Captain Lambart Brickenden, F.G.S.

Fig.	1.—	The inner aspect, showing three teeth, and the sockets of eighteen. a. Germ of a tooth. b. Perfect crown of a successional tooth. c. Remains of a successional tooth, the upper part having been broken off. d. The symphysial extremity of the jaw. e. The opercular furrow. f. The coronoid process.
	2.—	3, and 4, the teeth a, b, and c, in fig. 1, represented on a larger scale.

[639] For the outer aspect, and a restoration of the whole jaw, Petrif. pp. 247 and 249.

Lign. 221. Lower Tooth of the Iguanodon: nat. size. Wealden.
Tilgate Forest.
The apex slightly worn.

Fig.	1.—	Inner aspect, showing the longitudinal ridges, and denticulated margins of the crown of the tooth.
	2.—	View of the outer surface of the tooth. a. The denticulated margin. b. The apex of the crown, worn by use; b. fig. 2, shows the oblique smooth surface produced by mastication. c. A transverse fracture of the fang, showing a section of the medullary cavity occupied by the ossified remains of the pulp. d. Marks the inferior limit of the denticulated margin; if a line were carried horizontally from d, across the tooth, the under figure would represent a tooth worn flown below the denticulations, and deprived of its peculiar dental characters; in this latter state the tooth somewhat resembles an incisor of a Rhinoceros (see Ligns. [222], [223]; and Petrif. Lign. 48).