150 
DR. MANTELL ON A PORTION OF THE LOWER JAW 
f f. The haemapophysis, consisting of two branches which are anchy- 
losed to the body, or rather form continuous processes ; they ap- 
proximate to each other distally, but do not unite and form a 
chevron bone. 
c c. The oblique processes of the neurapophysis ; the spinous and 
transverse processes are not preserved. 
Fig. 8. The distal or condyloid extremity of a femur of the Iguanodon. 
8°. Posterior aspect ; 8®. anterior view of the same. 
Fig. 9. A series of six caudal vertebrae of an Iguanodon, from Tilgate Forest. 
Fig. 10. Omoplate of an Iguanodon (?) reduced to one-ninth linear. 
a. The head or sternal extremity. 
b, c, d. Apophyses, probably for the support of a cartilaginous pecto- 
ral arch. 
Fig. 11. Coracoid of an Iguanodon (?). 
a. The glenoid facet, or articulating surface. 
b. The scapular facet. 
c. Notch in the neck of the bone for the passage of vessels. 
d. Margin of the bone, which is entire. 
Fig. 12. Metatarsal bone of an Iguanodon. 
a. The proximal ; b. the distal extremity. 
Fig. 13. One of a series of four consecutive vertebrae of a Saurian; probably of 
the Iguanodon. 
a. The centrum, twenty-four inches in circumference. 
b , c, d. The neurapophysis. 
c, c. The oblique processes. 
d. Superior spinous process. 
e e. Transverse processes. 
m. The medullary canal. 
Fig. 14. Metatarsal bone of an Iguanodon. 
a. The proximal, and b. the distal extremity. 
PLATE X. 
Illustrative of the Osteology of the Hylceosaurus. 
The Figures in this Plate are reduced to one-sixth the size of the originals , in linear 
dimension. 
Fig. 1. Dermal spines of the Hylseosaurus ; these probably were situated along the 
back, and formed a dorsal fringe. 
a. The proximal or articulating extremity. 
Fig. 2. Portion of a dermal bone fractured in a transverse direction, showing the 
peculiar structure of these osseous appendages. 
