THE CLASS REPTILIA, 
The only existing forms of the class Reptilia 
are six extinct orders—are the following :— 
Order 1. CHELONIA (tortoises and turtles). 
2. LAcerTILta (lizards). 
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there 
1 3, OPHIDIA (serpents). 
1 4. Crocopita (alligators and crocodiles). 
The curious New Zealand lizard is by some authori- 
ties given an order to itself, but we need not concern 
ourselves with that point. As we have already said, 
our British reptiles are confined to the orders of ser- 
pents and lizards, and there are three representatives 
of each of these orders. 
These are as follows :— 
Order LACERTILIA or LIzArps : 
1. Lacerta vivipara, common lizard. 
2. Lacerta agilis, sand-lizard. 
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3. Auguis fragilis, slow-worm. 
Order OPIHIDIA or SERPENTS : 
1. Vipera berus, the adder. 
2. Lropidonotus natriv, ring snake. 
3. Coronella austriaca, smooth snake. 
The lizards do not come into the scope 
of this 
work, except in so far as their presence or absence 
affects the snakes, a point to be dealt with later on. 
They have been studied with great aceuracy and 
detail by various observers, and have a hterature of 
their own. 
