CONTENTS 



Foreword 



Preface 



Chapter i Introduction 



2 Historical Sketch 



3 Types of Vertebrate and Invertebrate Eyes 



4 

 5 

 6 



7 

 8 



9 



10 



ii 



12 



Eyes of Invertebrates : Coelenterates 

 Flat worms 

 Round worms 

 Rotifers . 

 Molluscoida 

 Echinoderms 

 Annulata 

 Arthropods 

 Molluscs 



PAGE 



vii 



XI 



13 Eyes of Types which are intermediate between 



Vertebrates and Invertebrates 



14 Hemichorda 



15 Urochorda 



16 Cephalochorda 



17 The Pineal System of Vertebrates 



1 8 Fishes 



19 Amphibians 



20 Reptiles . 



2 1 Birds 



22 Mammals 



23 Geological Evidence of Median Eyes in Vertebrates 



and Invertebrates ...... 



24 Relation of the Median to the Lateral Eyes 



XV 



Cyclostomes 



10 



81 

 84 

 86 

 88 

 9i 



93 



96 



103 



147 



168 



172 



174 

 178 



180 

 200 

 224 

 240 

 288 

 299 



327 



352 



c;of;f;9 



