Xll CONTENTS. 



PART II. 

 G EOL GICAL DISTRIB UTION. 



PAGE 



The succession of life. Faunas of the different geological periods . . 133 



II. 



Appearance and disappearance of species. Reappearance. Extinction. 

 Persistence of type-structures. Variation. Geological breaks. 

 Geographical distribution. Climatic zones. Synchronism of geo- 

 logical formations 181 



PART III. 

 GEOGRAPHICAL AND GEOLOGICAL DISTRIBUTION. 



I. 



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

 nifera. Corals. Brachiopoda. Mollusca generally. Crustacea, 

 Insecta, Arachmda, and Myriapoda 234 



II. 



Distribution of the Vettebrata. Fishes. Amphibians. Reptiles. Birds. 

 -Mammals . 287 



