OF TILGATE FOREST. 
proacliing it, excej)t the first rib of an ostrich, which 
has processes bearing a distant resemblance to the 
apo})hyses observable at the wider extremity. 
The drawing so accurately represents the ori- 
ginal, that a brief descrij)tion will suffice. The 
bone is slightly arched, of a prismatic form in the 
middle, and enlarged and Hat at both extremities : 
from the smaller end the bone contracts, then 
widens, and at not (piite one third from the other 
extremity sends off a small Hat apophysis; it then 
becomes enlarged, and terminates in two unequal 
Hat processes, which arc equal iu width to one 
third of the whole leim-th. If we consider the 
form of tliis bone, it appears that the only place it 
can hold in the skeleton must be either the thorax 
or lower extremities ; it may be a Hbula, a rib, or a 
clavicle ; and that it is a clavicle of some extra- 
ordinary extinct reptile is certainly most probable. 
Notwithstanding the analogy which the specimen 
from StoncsHeld bears to this bone, I am disposed to 
refer the Sussex fossil to the reptile which exhibits 
the most striking differences from all known types 
of saurian organisation — the Iguanodon. 
Bones of Hie e.rfremities. — Humerus, radius, and 
vlna. Of the Hrst I have two large examples, 
Avhich bear considerable resemblance to the corre- 
sponding bones of the Iguana, and ^Monitor. Of 
the ulna and radius I have seen no decided ex- 
amples, but a fragment which is 5 inches long, 
and was considered by M. Cuvier as resembling 
the head of a radius. 
Femur, tibia, and fbula. The fortunate dis- 
covery of a considerable portion of a femur in 
X 3 
