This section is from the "" book, by .
The class Reptilia is divided into the following ten orders, of which the first four are represented by living forms, whilst the remaining six are extinct:
1. Chelonia (Tortoises and Turtles).
2. Ophidia (Snakes).
3. Lacertilia (Lizards).
4. Crocodilia (Crocodiles and Alligators).
9. Deinosauria. 10. Theriodontia.
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