Xll CONTENTS. 



PART II. 



GEOL GICAL DISTRIB UTION. 

 I. 



PAGE 



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



II. 



Appearance and disappearance of species. Eeappearance. 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 anitnal groups. Forami- 

 nifera. Corals. Brachiopoda. Mollusca generally. Crustacea. 

 Insecta, Arachnida, and Myriapoda 234 



II. 



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

 Mammals . 287 



