261 



LIST OF ILLUSTRATIONS. 



Page 



4 



15 



1. Urticating organs of Ccelenterafa, after Gosse 



2. Development of Ccelenterata 



3. Morphology oi Hydra, after Hancock, Johx2ston, and Allen 



Thomson 



4. IMorphology of Hydrozoa 



5. Morphology of Cordylophora, after All man 



6. Eeproductive processes of Hydrozoa, after Gegenbaur 



7. Oceanic forms of LucemaridcB, after Gosse . 



8. Development of Cordylophora, after Allman 



9. Development of Tubidaria indivisa, after Mummery . 



10. Development of Campanularia, after Loven 



11. Development of jP%saZia, after Huxley 



12. Development of i/zzia, after Claparede 



13. Development of Twrr/s, i^ter Gosse .... 



14. Gemmation of Medusoids, after Forbes and the Author 



15. Development of C/irysaora, after Dah'ell . 



16. Morphology of Tub ulariadce, 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 Campanidariadca, after Alder and Hincks 



20. Morphology of Calycophoridce, after Kolliker 



21. Morpholog}' of Vehlla, after Kolliker 



22. Morphology of Physophoridce, after Kolliker 



23. Morphology of 3IedusidcB .... 



24. Various forms of lledusida; .... 



25. Luccrnaria, after Johnston .... 



S 3 



24 

 26 

 30 

 42 

 48 

 53 

 55 

 56 

 58 

 60 

 63 

 64 

 67 



91 

 94 

 97 

 104 

 109 

 116 

 117 

 122 



