viii CONTENTS. 



FAGE 



CHAPTER X. DEVELOPMENT 644 



Metamorphosis C51 



Parthenogenesis and Alternation of Genera- 

 tions 652 



Dimorphism and Polymorphism 654 



Individuality 656 



Hybridity 657 



XL THE GEOGRAPHICAL DISTRIBUTION OP ANIMALS 658 



Means of Dispersal 660 



Division of the Earth into Faunae 661 



Distribution of Marine Animals 664 



Chief Zoological Fauna? of the Earth,. 666 



XII. THE GEOLOGICAL SUCCESSION OP ANIMALS 668 



XIII. THE ORIGIN OF SPECIES 671 



XIV. PROTECTIVE RESEMBLANCE 675 



XV. INSTINCT AND REASON IN ANIMALS 680 



XVI. GLOSSARY 689 



XVII. INDEX . 697 



