ILLUSTRATIONS 



FIG. PAGE 



1. AMOEBA, FREE AND ENCYSTED . ... 3 



2. AMOEBA. DIAGRAM TO ILLUSTRATE MOVEMENT . . 5 



3. AMOEBA. DIAGRAMS TO ILLUSTRATE REPRODUCTION . 7 



4. PARAMECIUM 10 



5. PARAMECIUM. DIAGRAMS TO ILLUSTRATE REPRODUCTION 12 



6. VORTICELLA 14 



7. VORTICELLA. DIAGRAMS TO ILLUSTRATE REPRODUCTION 16 



8. CERCOMONAS 17 



9. NUCLEAR CHANGES IN CILIATA 23 



10. MONOCYSTIS. DIAGRAMS ILLUSTRATING LIFE-HISTORY . 26 



11. PLASMODIUM. DIAGRAM ILLUSTRATING LIFE-HISTORY . 27 



12. TRYPANOSOME 29 



13. HYDRA 31 



14. HYDRA. DIAGRAM OF STRUCTURE AND OF A GASTRULA 32 



15. HYDRA. SECTION OF AND VIEWS OF STINGING CELLS 34 



16. HYDRA. REPRODUCTIVE ORGANS AND DEVELOPMENT . 38 



17. OBELIA. HYDROID STAGE. . . . . . 41 



18. OBELIA. DIAGRAMS TO ILLUSTRATE DEVELOPMENT OF 



MEDUSOID, THE PLANULA LARVA AND ITS CONVERSION 

 INTO THE HYDROID .43 



19. DISTOMA. ALIMENTARY CANAL AND PROTONEPHRIDIUM 46 



20. DISTOMA. REPRODUCTIVE ORGANS . . ; . . 47 



21. DISTOMA. DEVELOPMENT . . . . . . 50 



22. LlMNAEA, THE INTERMEDIATE HOST OF DlSTOMA. .. 51 



23. TAENIA. SCOLEX AND PROGLOTTIDES . * . 53 



24. DIPYLIDIUM. TRANSVERSE SECTION OF PROGLOTTIS . 54 



25. TAENIA. PROTONEPHRIDIUM * . . . . 55 



26. TAENIA. CYSTICERCUS STAGE ., H ''"* . . 57 



27. MYA. LARVA . . . . . . 62 



28. MYA. YOUNG STAGE WITH LARVAL SHELL AND ADULT 



SHELL . . . . i: . . V- .. 62 



29. ANODONTA. SECTION OF SHELL AND MANTIE . " 5 . 63 



30. ANODONTA. GENERAL DISSECTION . . , 66 



31. ANODONTA. TRANSVERSE SECTION v , - V > 67 



32. ANODONTA. DIAGRAM OF PERICARDIAL CAVITY . 68 



