DR. MANTELL ON THE PELOROSAURUS. 
389 
e. Spinous process. 
f. Transverse process. 
g. Anterior oblique process. 
h. Depression on the spinous process, occupying the usual situation of the 
origin of the posterior oblique. 
i. Spinal canal. 
j. Chevron bone or haemapophysis. 
k. Hsemapophysial surfaces for articulation with the chevron bone. 
Fig. 6. A vertebra seen on the inferior aspect. 
Fig. 7 . Four anterior caudal vertebrae placed in a consecutive series. 
Fig. 8. A chevron bone 10 inches long, found imbedded in the same block of sand- 
stone as the vertebrae. 
8®. Outer aspect. 
8\ Inner aspect. 
8*. Lateral view. 
PLATE XXIII. 
The figures are ^ linear the natural size. 
Median and distal caudal vertebrae of the Pelorosaurus ? 
Fig. 9. A median or distal caudal vertebra with two eminences on the posterior end 
of the inferior aspect of the body, to articulate with a double-headed 
chevron of the crocodilian type. 
9". Lateral view. 
9*. Posterior face. 
9^ View of the inferior surface. 
k, k. The articulating facets to unite with the chevron bone. 
Fig. 10. A larger vertebra of a similar type, obtained from the same locality in Til- 
gate Forest as the other specimens figured in this memoir, by my friend 
Capt. Lambart Brickenden, F.G.S. 
10®. Inferior surface. 
10*. Lateral view. 
10®. Anterior view, showing the neural arch. 
Fig. 11. A caudal vertebra with the chevron bone anchylosed to the body, as in the 
distal caudals of the Mosasaurus. 
11®. Lateral view. 
11*. View of the inferior surface. 
PLATE XXIV. 
Perspective view of the largest anterior caudal, fth the natural size. 
