148 
DU. MANTELL ON A PORTION OF THE LOWER JAW 
in the Maidstone specimen near two long metacarpal bones, but its 
situation in the skeleton has not been accurately determined. 
Figs. 6, 7- Metatarsal bones. 
a a . Proximal extremities. 
Figs. 8, 9. 13. 29. Digital or phalangeal bones of the tarsus. These resemble the 
corresponding bones in the Hippopotamus and other gigantic herbi- 
vorous Mammalia. 
Figs. 10, 11. Distal phalangeal, ungueal, or nail-bones of the hind feet. 
Fig. 12. Inferior aspect of figure 11. 
Fig. 14. Metacarpal bone. 
a. Proximal extremity. 
h. Transverse section of the shaft. 
Figs. 15, 16. Ribs or costal processes.. 
a a. The bilobed, upper or spinal extremity. 
Fig. 17- An ungueal, or nail-bone, probably of the fore-foot. 
a. The proximal or articulating extremity. 
Figs. 18, 19. Anterior and posterior views of one of the Ossa Cuvieri of the Maid- 
stone Iguanodon. 
Fig. 20. This bone is undetermined. 
Fig. 21. Section of the tibia, showing the medullary cavity. 
Fig. 22. Tooth imbedded in the Maidstone specimen. 
Figs. 23. 26. Metacarpal bones ; a. proximal extremity. 
Figs. 24, 25. Caudal vertebrae. 
a. Centrum, or body of the vertebrae. 
b. Neurapophysis. 
c c. Oblique processes. 
d. Superior spinous process. 
e. Transverse processes. 
f. Haemapophysis, or chevron bone; g. articulating processes; h. spi- 
nous process. 
Fig. 27. Transverse section of the shaft of the femur at the inferior or lesser tro- 
chanter ; showing the medullary cavity. 
Fig. 28. The Maidstone specimen contains two corresponding bones of this form ; 
their proper position in the skeleton has not yet been ascertained. 
Fig. 29. Phalangeal bone of the hind-foot. 
Fig. 30. This bone lies across the femur in the Maidstone fossil ; it is much 
crushed, and its characters have not been clearly developed. 
Figs. 31, 32. Dorsal vertebrae of the Maidstone Iguanodon; the transverse and 
oblique processes are wanting. 
Fig. 33. Chevron bone, or haemapophysis ; g. articulating processes ; h. the inferior 
spinous process. 
