xviii COMPARATIVE ANATOMY 



7. THE CIRCULATORY SYSTEM .... 



8. FAT BODIES LUMINOUS BODIES 



9. THE RESPIRATORY ORGANS .... 



10. SOUND-PRODUCING APPARATUS .... 



11. SEXUAL ORGANS . . . .. . 



12. DIMORPHISM POLYMORPHISM . ~.- ; . . . 



13. DEVELOPMENT AND LIFE-HISTORY ;.. . .. 



14. PHYLOGENY . . . . . 

 Literature . . . . . % 



CLASS III. Arachnoidea sive Chelicerota 

 Systematic Review . , . . . , 



1. OUTER ORGANISATION 



A. THE BODY ...... 



B. THE EXTREMITIES . . . .. 



2. THE NERVOUS SYSTEM ..... 



3. THE EYES. . . . .'. 



4. GLANDS OPENING ON THE OUTER INTEGUMENT . 



5. THE INTESTINAL CANAL ..... 



6. THE BLOOD-VASCULAR SYSTEM .... 



7. THE RESPIRATORY ORGANS .... 



8. THE SEXUAL ORGANS ..... 



9. ONTOGENY ...... 



10. PHYLOGENY . . 



Literature . . . . '. . 



APPENDAGE TO THE ARTHROPODA 



Tardigrada . .... 



Literature 



