CONTENTS 



PAGE 



Preface to the English Edition v 



Preface to the American Edition ix 



List of Illustrations xvii 



Introduction i 



Definition of zoology ........ I 



Binomial nomenclature ....... 2 



Individual variations ........ 3 



Hybrids .......... 3 



Definition of morphology ....... 4 



Definition of histology ........ 4 



Definition of embryology ....... 4 



Classification ......... 5 



Phyla 7 



Organic evolution ........ 9 



Genealogical tree ........ 9 



Palaeontology ......... 10 



Fossils ........... 10 



Succession of life in time . . . . . . .11 



Phylogeny . . . . . . . . . .11 



Distribution of animals, in space and in time . . .11 

 The plankton . . . . . . . . .12 



The necton . . . . . . . . . .12 



The benthos 12 



Definition of a fauna ........ 12 



Zoo-geographical regions . . . . . . .12 



Definition of physiology ....... 12 



Definition of ethology or binomics 13 



xi 



