4 INTRODUCTION 



II. The CHELONIA : — Turtles. Terrapins, and 

 Tortoises. 



III. The CROCODILIA : — Crocodiles, Alligators, etc. 



IV. The LACERTILIA : — Lizards and Chameleons. 

 V. The OPHIDIA :— Snakes. 



Although in past geological ages Reptiles were the 

 preponderating type of the vertebrates, at the present day 

 there are in all but 4000 different species, a very low number 

 when compared to Fishes and Birds, the representatives 

 of which each number over 10,000. 



