xvi LIST OF ILLUSTRATIONS 



Fig. 30. Cysts and Mitosis in Actinosphrerium 

 ,, 31. Plasmodium and Spore Cases of Badhamia 

 ,, 32. Free Individuals and Cyst of Monocystis agilis . 

 , , 33. Conjugation of Monocystis agilis 

 ,, 34. Structure and Reproduction of Euglena viridis . 

 ,, 35. Mitosis in Euglena ..... 



36. Bodo saltans, Structure, Conjugation, and Spore Forma- 

 tion ....... 



,, 37. Polytoma uvella, Structure and Reproduction . 



,, 38. Pandorina morum ..... 



,, 39. Eudorina elegans ..... 



,, 40. Volvox globator ...... 



,, 41. Paramecium caudatum ..... 



, , 42. Stages in the Conjugation of Paramecium 



,, 43. Diagrams of the Course of Conjugation in Paramecium 



caudatum and Colpidium colpoda . . . zoo 



,, 44. Vorticella monilata . . . . 207 



,, 45. Stages in the Conjugation of Vorticella . . .211 



,, 46. Diagram of the Course of Conjugation in Vorticella 



monilata . . . . . .213 



,, 47. Hydra fusca and Hydra viridis .... 222 



,, 48. Longitudinal Sections of Body and Tentacle of Hydra. 



Nematocysts ...... 225 



,, 49. Isolated Cells from Hydra fusca .... 229 



,, 50. Development of Hydra ..... 239 



,, 51. Colony, Medusa and Enlarged Bases of Tentacles of 



Obelia geniculata ..... 242 



,, 52. Longitudinal Section through a hydranth of Obelia 



geniculata ...... 244 



,, 53. Development of the Medusa in Podocoryne carnea . 247 



