XV111 



LIST OF ILLUSTRATIONS. 



1. Ideal Section of the Crust 



of the Earth, 



2. Gregarina of the Earth- 



worm, .... 



3. Morphology of Rhizopoda, 



4. Amoeba, .... 



5. Actinophrys sol, 



6. Nonionina and Gromia, . 



7. Morphology of Foramini- 



fera, .... 



8. Formation of the com- 



pound Foraminifera, . 



9. Nummulites Itzvigatus, 



10. Acanthometrina and Poly- 



cystina, 



1 1 . Morphology of Radiolaria, 



12. Diagrammatic section of 



Spongilla, . 



13. Morphology and repro- 



duction of Spongida, . 



14. Morphology of Infusoria, 



1 5. Paramcecium bursaria and 



P. aurelia, . . . 



1 6. Va^inicola, Slentor, and 



Vorticdla, . 



17. Diagrammatic section of 



Actinia, 



1 8. Morphology of Plydrida, 



19. Morphology of Corynida, 



20. Reproductive buds of 



Hydrozoa, . 



21. Gonophore of Clytia 



Johnstoni, . 



22. Tubularia indivisa, . 



23. Hydractinia echinata, 



24. Morphology of Sertularida, 



25. Ovarian capsule of Sertu- 



laria operculata, 



26. Clytia Johnstoni, 



27. Morphology of Oceanic 



Hydrozoa, . . . 



28. Diphyes appendiculata, . 



