CONTENTS 



Xlll 



Chapter XIV 

 The Eyes of Birds 



The Class of Birds 

 General Configuration of the Eye. 

 The Avian Eye 



397 

 401 

 401 



Chapter XV 

 The Eyes of ]\Iam>iaxs 



The Class of Mammals 



1. The Monotreme Eye 



2. The Marsupial Eye . 

 The Sub-class of Placentals 



3. The Placental Eye . 



Aquatic Adaptations 



429 

 431 

 437 

 441 

 446 

 501 



Chapter XVI 

 The Central Organization of Vision 



General Principles 



II. 



The Nervous Control 



1. The Nerve -net 



2. Trunk-pathways 



3. The Ganglionic Nervous System 



(a) The Nervous System of Worms 



(6) The Nervous System of Arthropods . 



(c) The Nervous System of Molluscs 



4. The Central Nervous System of Vertebrates 



Hind-brain, 533 ; Mid-brain, 534 ; Diencephalon, 537 



mus, 538 ; Telencephalon, 542 

 Evolution of the Visual Pathways and Centres 

 The Hormonal Control ...... 



Hormones and Neuro -secretory Cells 



(a) The Neuro-endocrme System of Crustaceans 



(b) The Neuro -endocrine System of Insects 



(c) The Neuro -endocrine System of Vertebrates 



Optic Thala- 



509 

 511 

 614 

 616 

 617 

 518 

 521 

 527 

 530 



543 

 647 

 550 

 552 

 555 

 556 



Part III. The Function of the Eyes of Animals 



Chapter XVII 



The Vision of Invertebrates 



Methods of Investigation ..... 

 1. The Reactions of the Lower Invertebrates to Light 



(a) Protozoa ..... 



(b) Coelenterata ..... 



(c) Echinodermata .... 



567 

 670 

 570 

 571 

 571 



