44 
ROOM X. 
Nat. Hist. 
The American species, on the contrary, have no gland 
under the thighs, and the scales of the tail are not 
armed ; there are several species of this genus, as, Bur¬ 
nett’s Gerrhonotus ( Gerrhonotus Burnettii), and the 
Imbricated Gerrhonotus ( Gerrhonotus imbricatus). 
The Scheltopusiks ( Pseudopus ) have only rudiments 
of legs, in the form of undivided lobes, placed on the 
side of the vent; as in Durville’s Pseudopus ( Pseudo¬ 
pus Durmllii ):—The Glass Snakes ( Ophisaurus ) are 
quite destitute of legs ; as the Common Glass Snake 
(Ophisaurus ventralis ): all the species of these genera 
have the tympanum of the ear exposed. 
The Bimanas ( Chirotes ) of Mexico are subcylindri- 
cal, with small square scales, and only two short feeble 
legs, in the front of the body. The Amphisbasnae 
differ from the Bimanas in having no legs. 
The anterior and posterior extremities are equally 
blunt, and somewhat similar, which has led people to 
imagine, that they walk both backwards and forwards 
with the same facility—whence their name. 
Those ophisaurian reptiles which are destitute of any 
impressed lateral line, have been divided into several 
groups, as the True Seines ( Scincus ), having four legs, 
with small margined toes, and a sharp edged muzzle, 
which enable them to bury themselves with facility in 
the sand of the deserts they inhabit. 
Others have blunt noses, thin smooth scales, and long 
conical tails; as the New Holland Tiliqua (Lacerta 
scincoides ); the Ribbon Galley-Wasp (Lac. tceniolata) 
from New Holland,— but one of the New Holland kind 
(Trachydosaurus rugosus), has large rugose bony 
scales, and a short depressed tail. 
Some of the Seines (Lygosoma) have very long slen¬ 
der bodies, and very small, weak feet; as the short 
footed Lygosoma (Scincus brachypus), and the dotted 
Lygosoma (L. punctatum). 
The common Seps (S. chalcides) from the South of 
Europe, the form of whose body is nearly similar to 
that of the Seines, has only three toes on each foot; 
in 
