LIST OF ILLUSTEATIO^S. 



1. Diagram representing Transverse Sections of the Invertebrata and 



Vertebrata, . 16 



2. Gregarina of the Earth-worm, ..... 28 



3. Morphology of Ehizopoda, . . . . . .30 



4. Morphology of Foraminifera, ..... 34 



5. Nummulites Icevigatus, ....... 38 



6. AcantJiometra and Haliomma, ..... 39 



7. Morphology of Thalassicollida, . . . . . .40 



8. Diagrammatic Section of Fresh- water Sponge, ... 41 



9. Morphology and Eeproduction of Spongida, . . . .42 



10. Paramozcium, ........ 46 



11. Vaginicola, Stentor, and Vorticella, ... . . .48 



12. Diagram of Sea-anemone, . .. ^ . ... 51 



13. Morphology of Hydrozoa, ... ... . .53 



14. Tubularia indivisa, . , ., 61 



15. Morphology of Corynida, .62 



16. Eeproductive Processes of Hydrozoa,, ... 63 



17. Morphology of Sertularida, . . ~ . . . . . .67 



18. Gonophore of one of the Campanularida, .... 68 



19. DipJiyes appendiculata, . . . . , . . .71 



20. Portuguese Man-of-War and Velella^ .... 73 



21. Naked-eyed Medusao, . . . . . . .75 



22. Lucernaria auricula, . . . . . . . 78 



23. Development of Lucernarida, ... . . . .79 



24. Generative Zooid of one of the Lucernarida, ... 81 



25. Transverse Sections of Actinozoa and Hydrozoa, . . .85 



26. Morphology of Actinidce, ...... 86 



27. Structure of Coral-reefs, ....... 89 



28. Pennatula phospfiorea, ...... 91 



29. Morphology of Corals, . . . . . . .92 



30. Plewdbrachia pileus, ....... 93 



31. Morphology of EcJiinoidea, . . * . . . 97 



32. Cidaris papillata, ....... 98 



