CONTENTS

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PAGE
CHAPTER I.
Introductory 1
CHAPTER II.
Classification 23
CHAPTER III.
Morphology 50
CHAPTER IV.
Embryology 98
CHAPTER V.
PalÆontology 156
CHAPTER VI.
Geographical Distribution 204
CHAPTER VII.
The Theory of Natural Selection 251
CHAPTER VIII.
Evidences of the Theory of Natural Selection 285
CHAPTER IX.
Criticisms of the Theory of Natural Selection 333
CHAPTER X.
The Theory of Sexual Selection, and Concluding Remarks 379

Appendix to Chapter V. 421
Note A to Page 257 443
Note B to Page 295 445
Note C to Page 394 448
Index 451

                                                                                                                                                                                                                                                                                                           

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