Vill CONTENTS. 
CHAPTER IX. 
THE CHARACTERS OF GENERA . . . . . . . 
CHAPTER X. 
SPECIES AND BREEDS . . . . . . . . 
CHAPTER XI. 
FORMATION OF CORAL REEFS . : : Peer 
CHAPTER XII. 
AGE OF CORAL REEFS AS SHOWING PERMANENCE OF SPECIES 
CHAPTER XIII. 
HOMOLOGIES 
CHAPTER XIV. 
ALTERNATE GENERATIONS 
CHAPTER XV. 
THE OVARIAN EGG 
CHAPTER XVI. 
EMBRYOLOGY AND CLASSIFICATION . 
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175 
201 
233 
269 
296 
