LIST OF ILLUSTRATIONS 



FIG. PAGE 



1. Amceba proteus . . . . . . . . 15 



2. Amceba polypodia . . . . . . . . IS 



3. Quadrula, Hyalosphenia, Arcella, Difflugia .... 20 



4. Forms of Foraminifera ........ 22 



5. Shells of Foraminifera ........ 25 



6. Actinophrys sol ......... 26 



7. Actinosphxrium eichhornii ....... 27 



8. Forms of Heliozoa . . . . . . . .29 



9. Liteocircus annularis ........ 31 



10. Actinomma asteracanthion ....... 32 



11. Collozoum inerme ......... 33 



12. Euglena viridis ......... 35 



13. Forms of Mastigophora 37 



14. Forms of Choanoflagellata . . ..... 39 



15. Forms of Dinoflagellata ....... 40 



16. Noctiluca miliaris 41 



17. Volvox globator 43 



18. Paramcecium caudatum 47 



19. Forms of Ciliata ......... 49 



20. Forms of Tentaculifera 51 



21. Forms of Ciliata ......... 53 



22. Vorticella .......... 54 



23. Monocystis agilis ......... 56 



24. Gregarina . . . . . . . . . -57 



25. Ovum of a sea-urchin ........ 60 



26. Diagram of maturation and fertilization of ovum ... 61 



27. Segmentation of the oosperm ...... 62 



28. Forms of epithelium . . . . . . . . 64 



29. Diagram illustrating the structure of glands .... 65 



xvii 



