44 
ROOM X. 
Nat. Hist. 
cephalus ( Lacerta caudivolvula ), and the Ocellated 
Phrynocephalus ( Agama ocellatd). 
The Dragons {Draco) differ from all these by the 
skin of the sides being extended into the form of wings, 
and supported by the end of the ribs. The wings, 
when the animal is at rest, are folded together on the 
sides of the body, but when the creature leaps from 
branch to branch they are expanded, and act as a 
parachute; there are several species, differing from one 
another in the length of the throat pouches, and in the 
colour of the wings. 
The rest of the A games are furnished with a series of 
minute glands on the under side of the hind legs. Some 
of the species, peculiar to New Holland ( Gemmato - 
phora ), have the same rough scales as the Mutable 
Lizards; as the Muricated Agama ( Lacerta muricata ). 
The Lophurse have a crest of large scales on the 
back, as the Amboina Lophura {Lac. amboinensis ) ? 
which has been confounded with the Basilisk. 
The last groupe of Agamee, are peculiar for the tail 
being surrounded with verticillate bands of scales. In 
some of these ( Uromastyx ), the caudal scales are large 
and spinous; as the common Uromastyx {Stellio spi - 
nipes) from Egypt, and Hardwicke’s Uromastyx 
{Uromastyx Hardwickii) from India; while in the 
Chinese Uromastyx {Uromastyx Revesii), they are 
small and smooth. 
In the lower part of the Case are the Chameleons, 
long celebrated on account of the rapidity with which 
they change their colour; but most of the other Sau¬ 
rian Reptiles have the same faculty, and many in as 
great a degree. They are also peculiar for the great 
distance to which they can protrude the tongue, in 
order to catch insects, which form their principal food. 
Chameleons are only found in the warm parts of the 
Old World. 
The species are chiefly distinguished from each 
other by the peculiar shape of the head. In the 
common 
