261 



LIST OF ILLUSTRATIONS. 





i. Urticating organs of Ccelenterata, after Gosse 

 2. Development of Ccelenterata 



3 



Morphology of Hydra, after Hancock, Johnston, and Allen 

 Thomson 



4. Morphology of Hydrozoa 



5. Morphology of Cordylophora, after Allman 



6. Reproductive processes of Hydrozoa, after Gegenbaur 



7. Oceanic forms of Lucernaridce, after Gosse . 



8. Development of Cordylophora, after Allman 



9. Development of Tubularia indlvisa, after Mummery . 



10. Development of Campanularia, after Loven 



11. Development of Physalia, after Huxley 



12. Development of Lizzia, after Claparede 



13. Development of Turris, after Gosse .... 



14. Gemmation of Medusoids, after Forbes and the Author 



15. Development of Chrysaora, after Daly ell . 



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



hill Wright . . 



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



18. Morphology of Sertulariadce, after Alder, Daly ell, Forbes, 



and Johnston 



19. Morphology of Campanulariadce, after Alder and Hincks 



20. Morphology of Calycophorida, after Kolliker 



21. Morphology of Velella, after Kolliker 



22. Morphology of Physophoridce, after Kolliker 



23. Morphology of Medusidce .... 



24. Various forms of 31edusidce .... 



25. Lucernaria, after Johnston .... 



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84 

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9 1 



94 



97 



104 



109 

 116 

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122 



s 3 



