261 



LIST OF ILLUSTRATIONS. 



Page 

 4 

 15 



1. Urticating organs of Ccelenterata, after Gosse 



2. DeTelopment of Ccelenterata 



3. JMorphology of Hydra, after Hancock, Johnston, and Allen 



Thomson 



4. IMorphology of Hydrozoa 



5. Morphology of Cordylophora, after Allman 



6. Reproductive processes of Hydrozoa, after Gegenbaur 



7. Oceanic forms of Lucemaridcs, after Gosse . 



8. Development of Cordylophora, after Allman 



9. Development of Tubularia indivisa, after Mummery . 

 ro. Development of Campanularia, after Loven 



1 1. Development of Physalia, after Huxley 



12. Development of Lizzia, after Claparfede 



13. Development of TMrm, after Gosse .... 



14. Gemmation of Medusoids, after Forbes and the Author 



15. Development of C/trysaora, after Dalyell . 



16. Morphology of Ttibulariadce, after Alder, Forbes, and Stret- 



hill Wright . . 84 



17. Various forms of Coryniadce, after Alder, Forbes, and Sars 86 



18. Morphology of Sertulariadce, after Alder, Dalyell, Forbes, 



and Johnston 



19. Morphology of Campanulariadae, after Alder and Hincks 

 ao. Morphology of Calycophoridce, after Kolliker 



21. ]\Iorphology of Veldla, after Kolliker 



22. Morphology of Physophoridoe, after Kolliker 



23. ]Morphology of Medusidce .... 



24. Various forms of 3Iedusid(B .... 



25. Luccr/iarUi, after Johnston .... 



s 3 



91 

 94 

 97 

 104 

 109 

 116 

 117 

 122 



