302 
DR. MANTELL ON THE OSTEOLOGY OF 
i. Chevron bone. 
j. Spinal canal. 
h. Line of intervertebral anchylosis. 
1. Articulating surface for the head of the rib. 
Fig. 5. Anterior dorsal vertebra from the Isle of Wight. 
6“. Anterior view. 
5*. Posterior aspect. 
5''. Lateral view. 
Fig. 6. Cervical vertebra, in Mr. Saull’s Collection, lateral view ; the anterior con- 
vexity has been chiseled away. 
Fig. 7- Middle dorsal vertebra, in British Museum. 
7“. Lateral view. 
7** Anterior view. 
PLATE XXIX. 
Dorsal Vertehrae of the Iguanodon. 
(one-fourth linear, natural size.) 
Fig. 8. Middle dorsal vertebra. Isle of Wight ; found with fig. 4, Plate III. 
8“. Posterior aspect. 
8*. Anterior aspect. 
S'". Lateral view. 
Fig. 9. Posterior dorsal vertebra found with the above. 
Cervical Vertehrae of a very young Iguanodon. 
(natural size.) 
Fig. 9*. A series of three convexo-concave vertebrae from the Wealden of the Isle of 
Wight. 
9“*. The upper or dorsal aspect, showing the spinous and oblique processes 
of the neural arches ; the vertebrae are somewhat displaced, and in- 
jured by compression. 
9**. Lateral view of the same. 
9^^*. Lateral view of one of the vertebrae detached. 
This interesting series of cervicals (for the loan of which I am indebted to J. S. 
Bowerbank, Esq.) was associated with other portions of the skeleton of a very young 
individual, consisting of a connected suite of fourteen dorsal vertebrae of the usual 
type, several ribs with portions of the dermal integument, metatarsal, phalangeal, 
and ungueal bones, and several others which are at present too much concealed by 
the investing sandstone to admit of their identification. 
These vertebrae are especially instructive, because they establish the true charac- 
ters of the cervical region of the spine of the Iguanodon in a very young state. 
