Xll CONTENTS. 



PART II. 



GEOLOGICAL DISTRIBUTION. 



I. 



PAGB 



The succession of litb.— Faunas of the different geological periods . . 133 



II. 



Appearance and disappearance of species. — Eeappearanoe. — Extinction. — /^ 

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

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

 logical formations 181 



PAET III. 

 GEOGSAFHICAL AND GEOLOGICAL DISTRIBUTION. 



I. 



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

 nifera. — Corals. — Braehiopoda. — Mollusea generally. — Crustacea. — 

 Insecta, Arachnida, and Myriapoda 234 



II. 



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

 — Mammals 287 



