8 



THE PROTOZOA 



described in more detail in the next chapter namely, animal-like 

 (holozoic), plant-like (holophytic), fungus-like (saprophytic), or at 

 the expense of some other living organism (parasitic). 



The cellular organisms that constitute the 

 second or higher grade of the Protista are 

 commonly partitioned between botanists and 

 zoologists as Protophyta (unicellular algae and 

 fungi) and Protozoa respectively. It has been 

 pointed out already, however, that this 



c/r ^iJ 



^s 



E**^ 



oVooly<\ 



te^ll^ 



m$m 



w 



FIG. 4. Euglena spi- 

 rogyra. ces., CEsopha- 

 gus;st., stigma; c.r., 

 reservoir of the con- 

 tractile vacuole; P,P, 

 paramylum - bodies ; 

 N., nucleus. After 

 Stein. 



FIG. 5. Trichomonas eberthi, from the intestine of the 

 common fowl, fll., Anterior flagella, three in number ; 

 p. ft., posterior flagellum, forming the edge of the 

 undulating membrane ; chr.L, " chromatinic line," 

 forming the base of the undulating membrane; chr.b., 

 " chromatinic blocks " ; bl., blepharoplast from which 

 all four flagella arise ; m., mouth-opening ; N., nucleus ; 

 ax., axostyle. After Martin and Robertson. 



