from the sandstone of Tilg ate forest, Sussex. i S3 
d. Cavity or depression in the base of the fang, the' effect 
of absorption caused by the pressure of a secondary tooth.* 
e. Ridge extending down tlie front of the tooth. 
Fig. 2. This tooth evidently belonged to a young animal ; 
yet even in this example the apex is worn away, (see a. 
fig. 2 c.) The ridge extending down the front (see e fig. 2 a.) 
is more or less distinct in every specimen. 
Fig. 3. A tooth much worn by mastication. The serrated 
edges and other characters are obliterated, the tooth being 
worn down to the point marked by the line at g . fig. 1 . a. 
The fang has been removed by absorption ; and the cavity 
formed by the pressure of the new tooth is very deep. 
Fig. 4. In this specimen the point is perfect, and it there- 
fore more closely resembles the recent tooth (fig. 9.) than 
those above described. 
5. Is another example, where the point is but little worn. 
6. A large strong tooth less curved than fig. 1 and 2. It 
probably occupied a place in the posterior j^art of the jaw. 
7. In this figure, the cavity of the base of the fang for the 
reception of the new tooth is remarkably distinct. 
The teeth above described, although varying from each 
other in some particulars, do not present greater dissimila- 
rity than the differences arising from age, and the situation 
they respectively occupied' in the jaw, would be liable to pro- 
duce. Like the teeth of the recent iguana, the crown of the 
tooth is accuminated ; the edges are strongly serrated or 
The hollow here described is so constantly found in every example, that it 
cannot be accidental. From the close resemblance it bears to the cavity forhied in 
the base of the fangs of the recent iguana, by the secondary teeth, (Vide d, fig. 8) 
it may be confidently presumed that it is the effect of a similar cause. 
