PROTOZOA 



133 



jugation takes place between two similar individuals, 

 but in Vorticella and a few allied forms it is modi- 

 fied in such a way that it directly foreshadows the 

 fertilization of higher forms. A bud is given off from 



Fig. 74.— One of the vorticellidje (Epi6tylis) in budlike conjugation, r, buds 

 arising by division; k, a bud conjugating. ^From Her twig, after Greeff.) 



the side of an individual, which divides into eight tiny 

 motile cells. Each of these attaches itself to a full- 

 sized individual and is completely absorbed by it (Fig. 

 74). The resulting cell regains the power of rapid cell 

 division. 



Summary. — Protozoa are microscopic, one-celled ani- 

 mals in which one cell perforins all the functions. The 

 cells of any particular species are not differentiated 

 from each other, but within the cell special cell-organs 

 may develop. Protozoa are able to move from place 

 to place by means of flowing protoplasm or by means 



