CONTENTS. 



Introduction . 



PAGET 



1 



CHAPTER I. 

 Application of the Foeegoing Principles to the Lowest 

 Animals ........ 



18- 



Mollusca 



CHAPTER II. 



25 



Ants . 



CHAPTER III. 



31 



Bees and Wasps 



CHAPTER IV. 



143 



Termites 



CHAPTER V. 



108 



CHAPTER VI. 



Spiders and Scorpions 



20'f. 



CHAPTER VII. 

 Remaining Articulata . 



226' 



CHAPTER VIII. 



Fish 



2411 



CHAPTER IX. 

 Batrachians and Reptiles 



254: 



