CONTENTS. 



PAKT I. 



GEOGRAPHICAL DISTRIBUTION. 



I. 



PAGE 



General principles of zoogeography. Faunal variation. Faunas of isola- 

 tion. Kelations of past and present faunas. Origination of faunas . 1 



IL 



Areas of specific distribution. Generic distribution. Distribution of fam- 

 ilies and orders. Conterminous and discontinuous areas of distribu- 

 tion - 17 



III. 



Conditions affecting distribution. Climate. Food-supply. Barriers to 

 migration. Migrations of mammals and birds. Dispersal of amphib- 

 ians and reptiles. Dispersal of insects and moll usks . . . .35 



IV. 



Zoological regions. Holarctic realm. Neotropical. Ethiopian. Orien- 

 tal. Australian. Polynesian. Tyrrhenian, Sonoran, and Austro- 

 Malaysian transition regions 55 



V. 



Distribution of marine life. Nature of the deep-sea fauna. Oceanic 

 pelagic fauna. Littoral fauna. Pelagic faunas of lakes. Deep-lake 

 faunas . 109 



