CONTENTS 



PART I 

 THE SKELETON OF REPTILES 



INTRODUCTION 



PAGE 



The Primitive Skeleton of Reptiles 3 



The Primitive Skull of the ReptHia 6 



The Primitive Postcranial Skeleton 7 



CHAPTER I 



The Skull of Reptiles g 



External Appearance, Excrescences, Chief Openings . 9 



The SkuU Elements 13 



The Mandible 27 



The Skull of the Cotylosauria 33 



Chelonia 44 



Theromorpha 46 



Therapsida 52 



Nothosauria 56 



Plesiosauria 56 



Placodontia 59 



Ichthyosauria 60 



Protorosauria 62 



Squamata , 65 



LacertUia or Sauria 66 



Ophidia or Serpentes 72 



Rhynchocephalia 74 



Pseudosuchia 77 



Pelycosimia 77 



Phytosauria 79 



Crocodilia 83 



Dinosaurs (Saurischia, Ornithischia) 87 



Pterosauria 88 



CHAPTER II 

 The Vertebrae 



90 



CHAPTER III 

 The Ribs and Sternum 112 



p-a 



X'\^ 



