xvi COMPARATIVE ANATOMY 



PAGE 



6. THE BODY CAVITY, THE MUSCULATURE WHICH PASSES TRANSVERSELY 



THROUGH IT, THE DISSEPIMENTS AND MESENTERIES . . .211 



7. THE NERVOUS SYSTEM ....... 215 



8. SENSORY ORGANS ........ 228 



A. ORGANS OF TOUCH ....... 228 



B. EYES . . . . . . . .229 



C. OLFACTORY ORGANS (Ciliated Organs) . . . .231 



D. ORGANS OF TASTE (Cup-shaped Organs) .... 233 



E. LATERAL ORGANS ....... 233 



F. AUDITORY ORGANS ....... 234 



G. THE LATERAL EYES OF POLYOPHTHALMUS . . . 234 



9. EXCRETORY ORGANS NEPHRIDIA ..... 235 



10. RESPIRATORY ORGANS ....... 246 



11. BLOOD-VASCULAR SYSTEM ...... 248 



12. GENITAL ORGANS ........ 254 



13. PARTHENOGENESIS ..'..... 266 



14. ASEXUAL REPRODUCTION BY GEMMATION AND FISSION . . . 266 



15. STOCK FORMATION ....... 267 



16. ONTOGENY OF THE WORMS ...... 268 



Literature . . 283 



CHAPTER V 



ARTHROPODA ARTICULATA 



First Division Crustacea 

 Systematic Review . . . . . . . .288 



1. OUTER ORGANISATION . ..... 300 



A. THE BODY ........ 300 



B. THE EXTREMITIES . . ... 307 



C. THE RESPIRATORY ORGANS GILLS .... 324 



2. THE INTEGUMENT . . .... 330 



3. THE MUSCULATURE . . .... 331 



4. THE ENTERIC CANAL . . .... 336 



A. THE FORE-GUT . . .... 336 



B. THE MID-GUT . . .... 338 



C. THE HIND-GUT ... ... 341 



5. THE NERVOUS SYSTEM ....... 342 



6. THE SENSORY ORGANS . ..... 351 



A. EYES ........ 351 



B. OTHER SENSORY ORGANS 355 



