Xll CONTENTS. 



PART II. 



GEOLOGICAL DISTRIBUTION. 



1. 



PAGE 



The succession ol lite. — Faunas of the different geological periods . . 133 



II. 



Appearance and disappearance of species. — Eeappearance. — Extinction. — 

 Persistence of type-structures. — Variation.— Geological breaks. — 

 GeoijTaphical distribution.— Climatic zones. — Synchronism of geo- 

 logical formations 181 



PART III. 

 GEOGFAPHICAL AND GEOLOGICAL DISTRIBUTION. 



The present and past distribution of individual animal groups.— Forami- 

 nifera.— Corals. — Brachiopoda. — MoUusca generally. — Crustacea. — 

 Insecta, Arachnida, and Myriapoda 234 



II. 



DistributionoftheVertebrata.— Fishes.— Amphibians.— Eeptiles.— Birds. 

 -Mammals 287 



