CONTENTS. 



PART I. 

 GEOGRAPHICAL DISTRIBUTION. 



I. 



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

 tion. — Eelations of past and present faunas. — Origination of faunas . 1 



II. 



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

 ilies and orders. — Conterminous and discontinuous areas of distribu- 

 tion . .... IT 



III. 



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

 migration. — Migrations of mammals and birds. — Dispersal of ampiiib- 

 ians and reptiles. — Dispersal of insects and mollusks . . 85 



IV. 



Zoological regions. — Holarctic realm. — Neotropical. — Etbiopian. — 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. — Pela;iio faunas of lakes. — Deep-lake 

 faunas 1 • • 109 



