4 INTRODUCTION 



II. The CHELONIA : — Turtles, Terrapins, and i 

 Tortoises. | 



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



IV. The LACERTILIA : — Lizards and Chameleons. i 

 V. The OPHIDIA :— Snakes. 



Although in past geological ages Reptiles were the i 

 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. ' 



