CONTENTS 



PAGE 



Chapter I. 

 Introduction i 



Chapter II. 

 Geological Conditions in relation to the Evolution of 



Fishes 23 



Chapter III. 

 The Evolution of Fishes from Invertebrates 60 



Chapter IV. 

 The Physical and Biological Environment of Fishes 



in Silurian and Devonian Times 96 



Chapter V. 

 The Physical and Biological Environment of Fishes 

 in Carboniferous and Permian Times 137 



Chapter VI. 

 The Physical and Biological Environment of Fishes 



during the Triassic- Jurassic Period 172 



Chapter VII. 

 The Physical and Biological Environment of Fishes 



during the Cretaceous Period 208 



Chapter VIII. 

 The Physical and Biological Environment of Fishes 



from Eocene to Recent Times 231 



