292 
PLESIOSAIJRUS. 
examination of the large specimen on the table 
will, by this arrangement, come before us toward 
the conclusion of this paper, and we shall thus, by 
the previous consideration of the osteology of the 
other genera, be prepared for the investigation of 
its peculiar characters. 
Plesiosaurus dolichodeirus. * — The teeth of 
this extraordinary animal, as shown in the admir- 
able memoir of Mr. Conybeare, are “ conical, very 
slender, curved inwards, finely striated on the ena- 
melled surface, and hollow throughout the interior; 
they resemble those of the Crocodile, but are more 
slender.” Many teeth of this kind have been found 
in the Tilgate strata, but the existence of the 
Plesiosaurus in these deposits does not rest on 
this indication alone : vertebrae occur which are 
identical with those of Lyme Regis ; they belong 
to the cermcaly dorsaU and caudal : no other bones 
have been identified. 
Cylindricodon. — Under this name. Dr. Jaeger, 
of Stutgard, has described the remains of a fossil rep- 
tile, of which almost the entire upper jaw, with the 
teeth, has been discovered by him in the keuper 
formation of Germany, near Wirtemburg. He con- 
siders the original to have been herbivorous, and 
describes it as characterised “ par les dents laterales 
* This wonderful creature has been already described p. 281.: the 
annexed wood-engraving represents the skeleton, as restored from 
specimens discovcreil at I.ynie Regis. 
