CONTENTS 



CHAPTER PAGE 



I. Introduction i 



II. Classification of Reptiles 13 



III. The Skeleton of Reptiles 19 



IV. The Age of Reptiles 44 



V. Adaptation of Land Reptiles to Life in the Water . . 59 



VI. Order Sauropterygia 73 



Plesiosauria. 

 Nothosauria. 



VII. Order Anomodontia 102 



Lystrosaurus. 



VIII. Order Ichthyosauria 107 



IX. Order Proganosauria 126 



Mesosaurus. 



X. Order Protorosauria 132 



Protorosaurus. 

 Pleurosaurus. 



XL Order Squamata 138 



Lizards. 



Mosasaurs. 



Snakes. 



XII. Order Thalattosauria 171 



XIII. Order Rhynchocephalia 176 



Choristodera. 



XIV. Order Parasuchia 184 



Phytosauria. 



XV. Order Crocodilia 194 



Eusuchia. 



Mesosuchia. 



Thalattosuchia. 



XVI. Order Chelonia 216 



Side-necked Turtles. 

 Snapping Turtles. 

 Fresh-water or Marsh Tortoises. 

 Land Tortoises. 

 Sea-Turtles. 

 Ancient Sea-Turtles. 

 Leather-back Marine Turtles. 

 River Turtles. 



Vll 



11 on 



