CONTENTS 



CHAPTER I PAOE 



Animals which have lately become Extinct — 



The Strata of the Earth's Crust . . 1 



CHAPTER II 



Strata and Land Surfaces — Teeth and Bones- 

 Extinct Men — Flint Implements — The Mam- 

 moth Elephants and Mastodon — Classifi- 

 cation of Animals ..... 59 



CHAPTER III 



The Ancestral History of Elephants — Extinct 

 Horses and Rhinoceroses — The Arsinoithe- 

 rium 103 



CHAPTER IV 



Extinct Giraffes and the Okapi — The Giant 

 Sloths of South America and the Giant Kan- 

 garoos of Australia 155 



vii 



