OF TILGATE FOREST. 
311 
those of the Iguana, and Monitor. A group of 
four bones has lately been discovered of the last 
mentioned species ; and although they are dis- 
placed and mutilated, yet they form a highly 
interesting specimen : they give the following ad- 
measurements : — 
1st, or longest bone, 8 inches long. 
2d ; this is imperfect, but was probably as large 
as the first. 
3d, C)J- inches long. 
4th, 3J inches long. 
There can be no doubt that these bones formed 
part of the foot of an Iguanodon, or similar reptile ; 
they are about ten times the size of the similar 
bones of a recent Iguana 5 feet long. 
Unguical or claw-hone. The distol phalangeal 
bone of these reptiles constitutes a claw, and is pro- 
tected by a horny covering, or nail : a most interest- 
ing bone of this kind has been found in the Tilgate 
grit, and is figured PI. III. fig. 1. ; and the corre- 
s})onding bone of the Iguana, and the nail which 
covered it, are represented of the natural size in 
the same plate, figs. 2, 3. : the analogy between the 
recent and fossil bones is most perfect, the latter 
differing but in magnitude, being about sixteen 
times larger, thus indicating a total length of 80 feet. 
A smaller but more perfect claw-bone has recently 
been found by the Marquess of Northampton, and 
through his Lordship’s liberality is added to my 
collection ; it is 37 inches long, and shows the dis- 
tal termination of the claw in a very beautiful man- 
ner ; two other specimens only have been noticed. 
X 4 
