CONTENTS. IX 



CHAPTER IX. 



THE HOLARCTIC REGION. 



Characteristics of the Mammalian Fauna Mammals of the Eastern Holarctic 

 Region Plistocene Fauna of the Holarctic Region Geographical Changes 

 since the Plistocene Western Division of the Region Arctic Sub-region 

 European Sub-region Central Asian Sub-region Tibetan Sub-region 

 Mantchurian Sub-region Mediterranean Sub-region Kashmir Ca- 

 nadian Sub-region Transition Zone . . . . . . 308 



CHAPTER X. 



THE SONORAN REGION. 



Limits Characteristics of Mammalian Fauna Extinct Groups of Mammals 

 characteristic of Western Arctogrea Distinctness of the Region Dual 

 origin of Groups . . .. . . .-..'.'' V '' '. 363 



APPENDIX. 



LIST OF WORKS AND PAPERS .- &*&, . . ..:..-, fj . 383 

 INDEX . . . . V . 386 



MAP SHEWING DISTRIBUTION OF ANIMALS . . . , to face Title 



