CONTENTS 



PAGE 



PREFACE v 



CHAPTER 



I. THE CONTINUITY OF LIFE i 



II. THE PHYLOGENESIS OF VERTEBRATES 26 



III. THE ONTOGENESIS OF VERTEBRATES 48 



IV. THE INTEGUMENT AND THE EXOSKELETON ... 76 

 V. THE ENDOSKELETON 122 



VI. THE MUSCULAR SYSTEM 189 



VII. THE DIGESTIVE AND RESPIRATORY SYSTEMS . . . 257 



VIII. THE VASCULAR SYSTEM 317 



IX. THE URO-GENITAL SYSTEM 365 



X. THE NERVOUS SYSTEM 406 



XL THE SENSE-ORGANS 465 



XII. THE ANCESTRY OF THE VERTEBRATES ..... 506 



APPENDIX 539 



