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DR. MANTELL ON THE OSTEOLOGY OF 
Fig. 12. Posterior caudal vertebra of the Iguanodon. 
12“. Anterior aspect. 
12*. Lateral view. 
Fig. 13. Distal caudal vertebrae of the same; one-half natural size. This specimen 
and the preceding are from Tilgate Forest. 
Fig. 14. A middle sacral vertebra of the Iguanodon from Brook Bay; one-half na- 
tural size. In the collection of J. Baber, Esq., of Knightsbridge. 
14“. Lateral view. 
14*. Upper or spinal aspect. 
Figs. 15, 16, 17. Represent portions of a chain of sacral and caudal vertebrae of the 
same Iguanodon : from Charlwood in Surrey. In the cabinet of 
P. Martin, Jun., Esq., of Reigate. 
Fig. 15. The two anterior sacrals; foramen for the transit of the sacral nerves. 
Fig. 16. An entire middle sacral, with portions of the adjoining vertebrae anchylosed 
at each end. 
Fig. 17. Four consecutive anterior caudals with remains of the chevron bones (*). 
PLATE XXXI. 
Humeri or Arm-bones of the Iguanodon. 
Fig. 18. Inferior portion of the right Humerus of a young Iguanodon; one-third 
natural size. 
18“. Front or anterior view. 
18*. Lateral view. 
1 8^ Posterior view. 
18*^. The condyloid articulating surface seen from below. 
Fig. 19. Right Humerus, one-twelfth natural size: from the Isle of Wight; in the 
possession of Mr. Fowlstone of Ryde. 
19®. Posterior view. 
19*. Front or anterior aspect. 
19®. Articulating surface of the proximal extremity of the bone seen from 
above. 
1 9*^. Distal or condyloid articulating surface seen from below. 
Fig. 20. Right Humerus of the Iguanodon, from the Maidstone specimen in the 
British Museum ; one-sixth natural size : the posterior aspect only is 
exposed. 
Fig. 21. Upper extremity of the Humerus of a very young Iguanodon : from Tilgate 
Forest ; one-third natural size. 
21®. Posterior aspect. 
21*. Anterior view. 
21®. Articulating surface of the proximal extremity seen from above. 
