OF THE IGUANODON, AND OTHER SAURIAN REMAINS. 
149 
Fig. 34. Lumbar vertebra, with the spinous process broken off. 
Figs. 35, 36. Dorsal vertebrae. 
Fig. 37- Caudal vertebra. The following references apply also to the dorsal and 
lumbar vertebrae : — 
a. Body or centrum. 
b. Neurapophysis, united to the centrum by suture. 
c c. Oblique processes. 
d. Superior spinous process. 
e e. Transverse processes. 
0 . Marks the depression or pit occasioned by the loss of the transverse 
process, which was united by suture to the body below, and to the 
medullary arch above : in the adult it is anchylosed to these ele- 
ments. 
w w. The haemapophyseal surfaces for the attachment of the chevron bone ; 
see g, fig. 24. 
PLATE IX. 
Illustrative of the Osteology of the Iguanodon, and other fossil Sauriam from the 
Wealden. 
Fig. 1. Fragment of an atlas of a young Iguanodon, in which the form of the 
medulla oblongata is shown in a cast of calcareous spar {a a). 
Fig. 2. The horn of a Saurian, probably of the Iguanodon. 
Fig. 3. The facial portion of the skull of the Iguana cornuta, with the nasal 
tubercles or horns, for comparison with the fossil, fig. 2. 
Fig. 4. Two vertebrae, having the body or centrum concavo-convex. 
a a. The convex face. 
c. The remains of the oblique processes ; the other portions of the 
neurapophysis are wanting. 
Fig. 5. A sacral vertebra of a reptile, approximating to that of the Monitor, 
a. The centrum seen on its visceral aspect, 
c. Oblique processes. 
e e. Transverse processes. 
Fig. 6. A caudal vertebra of a reptile, with two tubercles (f) for the attachment 
of the haemapophysis. 
6 a . Visceral aspect of the bone. 
6 J . Distal surface of the centrum (a) \f the haemapophyseal tubercles. 
6 C . Lateral view of the same vertebra. 
Fig. 7- Caudal vertebra of an unknown Saurian from Tilgate Forest ; unique. 
7°. Visceral aspect ; f. lateral view. 
a a. Anterior articulating surface of the centrum. 
x 2 
