CONTENTS xv 



CHAPTER III 

 PLATODES 



PAGE 



Systematic Review . . . . . . , .133 



1. GENERAL REMARKS .... . 135 



2. THE BODY FORM ..... 137 



3. THE OUTER BODY EPITHELIUM . . ... 138 



4. THE GASTRO-CANAL SYSTEM . .... 138 



5. SUPPORTING ORGANS, PASSIVE ORGANS OF LOCOMOTION . . 143 



6. THE MUSCULATURE ....... 144 



7. ORGANS OF ADHESION ....... 145 



8. THE NERVOUS SYSTEM . ..... 146 



9. THE SENSORY ORGANS ....... 149 



10. THE BODY PARENCHYMA ..... . 151 



11. THE EXCRETORY OR WATER-VASCULAR SYSTEM .... 152 



12. THE SEXUAL ORGANS ....... 154 



13. ASEXUAL REPRODUCTION AND ITS ORIGIN THE ORGANISATION OF THE 

 CESTODA ......... 163 



14. ONTOGENY OF THE POLYCLADA . . . . . .167 



15. THE LIFE-HISTORY OF THE TREMATODA ..... 168 



16. THE LIFE-HISTORY OF THE CESTODA ..... 171 

 THE INFLUENCE OF PARASITISM ON THE STRUCTURE AND DEVELOPMENT OF 



ANIMALS ......... 172 



STROBILATION AND SEGMENTATION . . . . . .175 



Literature ........ 176 



CHAPTER IV 



VERMES 



Systematic Review . . . . . . . .178 



1. FORM OF BODY AND OUTER ORGANISATION .... 186 



2. THE INTEGUMENT . . . . . . .191 



3. THE DERMO-MUSCULAR TUBE . . . . . .193 



4. THE PROBOSCIS OF THE NEMERTINA AND ACANTHOCEPHALA . . 197 



5. THE INTESTINAL CANAL ....... 200 



A. THE FORE-GUT . . 201 



B. THE MID-GUT . . 205 



C. THE HIND-GUT AND THE ANUS 209 



