TABLE OF CONTENTS 



PAGE 



INTRODUCTION xi 



PART I 



I. OBJECT AND LINE OF ARGUMENT i 



II. THE OUTER BODY FORM . . . 1 1 



III. THE APPENDAGES 26 



IV. THE MUSCULATURE 52 



V. THE NERVOUS SYSTEM 67 



VI. THE SENSORY ORGANS 84 



VII. THE ALIMENTARY CANAI 112 



} VIII. THE CIRCULATORY SYSTEM 117 



IX. THE EXCRETORY AND OTHER GLANDS 124 



X. REPRODUCTION 140 



XI. DEVELOPMENT THE XAUPLIUS 148 



