278 
IGUANODON 
Bones, supposed to he referable to the Iguanodon, 
We have already stated, that no united portion 
of the skeleton of this animal has been discovered: 
and since the bones of other gigantic reptiles 
are entombed with those of the Iguanodon, the 
attempt to identify the latter cannot, of course, be 
regarded as affording positive conclusions. 
Bertehrce. — With the able assistance of the Rev. 
W. D. Conybeare, we examined our collection of 
vertebrm from Tilgate Forest, and after having 
separated those that appeared to belong to the Cro- 
codile, Plesiosaurus, and Megalosaurus (or, rather, 
which resembled those from Stonesfield), several 
enormous vertebrae remained, which corresponded 
with each other, but differed from any we had pre- 
viously noticed. The faces of the bodies of these 
vertebrae are almost flat on one side, and slightly 
depressed on the other ; and are rather quadran- 
gular. The spinous and lateral processes are very 
strong and thick. There is not that deep de- 
pression beneath the annular part of the vertebrae 
which is said to characterize those of the Mega- 
losaurus. From their enormous magnitude, and 
from the circumstances above stated, we are in- 
duced to refer them to the Iguanodon, the other 
gigantic lizard of the Tilgate strata. We have one 
sacral vertebra, which is almost identical with that 
of the Monitor*, except that the body is slightly 
concave on both faces : this bone, if perfect, would 
measure ten inches from the extremity of one 
transverse process to the other. Some of the de- 
tached processes in our possession indicate vertebrm 
* Oss. Foss. vol. V. pi. xvii. fig. 27. 
