Wall Lizard (Lac muralis ), found on heaths 
near London. This animal is said to be both 
oviparous and viviparous, and has been con¬ 
founded by authors with another species ( La - 
certa agilis ), not a native of Britain. Lastly, 
the Swift Lizards ( Tachydromus ), which very 
much resemble the True Lizards, but have an 
exceeding long body and tail, with their fore 
and hind legs very far apart, and the back co¬ 
vered with shields somewhat like those on the 
belly. They are found in China and Java, and 
are said to run with amazing velocity. Most 
of these animals have the faculty of reproduc¬ 
ing their tails when broken off, an accident 
which often happens in the mere exertion of 
the animal to escape. The reproduced part 
has only a central cartilage in the place of the 
bones, and is often covered with scales, different 
from those of the rest of the tail. If the tail be 
cracked only on one side, and not thrown off, a 
new tail often springs out of the crack, so that 
the member becomes forked. A specimen of 
a Lizard with such a tail, may be seen in this 
Case. 
Cases 3 and 4 contain those Saurian Rep¬ 
tiles which have short contractile tongues, 
slightly notched at the end. 
The first of these are the Iguanas , which 
have their teeth attached to the inner edge of 
e 2 the 
