OF TILGATE FOREST. 
279 
of enormous proportions.* Our cabinet contains 
three very small vertebrae, which are anteriorly 
concave and posteriorly convex, as in the recent 
Iguana ; and these, with the exception of two large 
examples, are the only instances of such a structure 
we liave met with in the vertebrae of the Wealden. 
A chevron-bone., of a magnitude corresponding 
with the largest of the vertebrae, has also been 
found. 
Extremities Fragments of thigh-bones, of a 
monstrous size, are occasionally found in the sand- 
stone of the Forest : we have one specimen which 
is no less than 23 inches in circumference. Were 
it clothed with muscles and integuments of suitable 
proportions, where is the living animal with a thigh 
that could rival this extremity of a lizard of the 
primitive ages of the world? 
Metatarsal and phalangeal bones . — Some of these 
are so large, that they appear more like the bones 
of mammoths or elephants, than of reptiles. M. 
Cuvier, with his usual candour, observes, “Des frag- 
ments d’os du metacarpe ou du metatarse sont si 
gros, qu’au premier coup-d’oeil je les avois pris 
pour ceux d’un grand hippopotame.”f 
We have one metatarsal bone of the following 
gigantic proportions : — 
Length of the bone, 4^ inches. 
Circumference of the largest (tarsal') extremity, 
13 inches. 
We have shown that the teeth of the Iguanodon 
* A spinous process, probably of a caudal vertebra, is 12 inches 
long. 
f Oss. Foss. vol. V. p. .3o0. 
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