CONTENTS 



CHAPTER I 



PAGE 



Environment and the Evolution of Vertebrates 23 



CHAPTER II 

 The Dentition of Lower Vertebrates 33 



CHAPTER III 



The Ancestry of the Mammalia 41 



CHAPTER IV 



The Relation Between Life Habits and Dentition 64 



The Marsupials. 



CHAPTER V 

 The Insectivores 95 



CHAPTER VI 

 The Primates (Except Man) 106 



CHAPTER VII 

 The Human Dentition 136 



CHAPTER VIII 

 Anomalies of the Human Dentition 155 



CHAPTER IX 



The Edentates 164 



Retrogression in Evolution. 



17 



