12 LIST OF ILLUSTRATIONS 



Cnida of Madrepore 410 



Cnida of Tealia Crassicornis (discharged) 413 



Cnida of Co^nactis 418 



Forms of Amoeba (successively drawn from one individual) 436 



Section of Sponge , 433 



Three-sided Euglena 438 



Swan-neck and its Divisions 443 



Paramoecium. 446 



Coleps and Chilomonas 447 



Vorticelke 451 



Acineta 456 



Vaginicola 460 



Euplotes 466 



