CONTENTS. 



PAGR 



PEEFACE v 



I. GENERAL INTRODUCTION. 



1. THE POSITION OF MAMMALS IN THE ANIMAL KINGDOM. . 1 



2. PHENOMENA OP CONVERGENCE 14 



3. THE DISTINCTIVE CHARACTERISTICS OF MAMMALS . . . 30 



4. THE EXTENSION OF PAL^EONTOLOGICAL SCIENCE SINCE 



CUVIER 45 



5. THE STRATA OF THE TERTIARY FORMATION . . . . 77 



II. SPECIAL COMPARISON OF THE LIVING 

 MAMMALS AND THEIR ANCESTORS. 



1. THE MONOTREMA, CLOACAL OR FORKED ANIMALS . . 86 



2. THE MARSUPIALS , , . 93 



3. THE EDENTATA, OR ANIMALS POOR IN TEETH . . . 110 



4. THE UNGULATA, OR HOOFED ANIMALS 126 



PAIR-HOOFED ANIMALS. 



1. The Suidse, or Pigs 137 



2. The Hippopotamus, or Kiver Horse . . . . 144 



3. The Ruminants 150 



4. Camels 154 



6. Deer and their Kindred Forms .... 153 



6. Hollow-horned Animals, Antelopes and Oxen . 173 



2 



