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 Ichthyosaxjria . . 107 



IX. Order Proganosauria . . . .... 126 



Mesosaurus. 



X. Order Protorosauria . . . . 132 



Protorosaurus. 

 Pteurosaurus. 



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. 



vii 



