64 
SYSTEM OF NATURE. 
character will be found in the crocodile and lizards, a 
similar natant character in the turtle and Ichthyosaurus, a 
similar ambulant, slow, obese character in the tortoise 
and toad, a similar reptant and gliding character in Am- 
phisbaena and the snakes : other parallels might be intro¬ 
duced, especially with reference to the placentals: the 
climbing chameleon is perhaps a representative of a lemur, 
a parrot or an opossum. These instances are adduced rather 
as evidence of the existence of the usual diversity of eco¬ 
nomy, than from any idea of their exactness or precision. 
The following parallels between the four most striking 
divisions of each class are suggested for consideration ra¬ 
ther than insisted on as satisfactory. It should, however, 
be observed, that several of the groups indicated by the 
genera cited are obviously double, consequently there would 
be no difficulty in extending the number of divisions. 
CATAPHRACTA. 
REPTILIA. 
Testudo 
Chelonia 
Crocodilus 
Amphisbaena 
Rana 
Plesiosaurus 
Lacerta 
Ophidia. 
