V1U CONTENTS. 



CHAPTER IX. 



tHE CHARACTERS OF GENERA . 136 



CHAPTER X. 



SPECIES AND BREEDS < 184 



CHAPTER XI. 



FORMATION OF CORAL REEFS 148 



CHAPTER XII. 



AOE OF CORAL REEFS AS SHOWING PERMANENCE OF SPECIES 176 



CHAPTER XIII. 



HOMOLOGIES 201 



CHAPTER XIV. 



ALTERNATE GENERATIONS 288 



CHAPTER XV- 



I-HE OVARIAN EGG 288 



CHAPTER XVI 



EMBRYOLOGY AND CLASSIFICATION ...... 288 



