52 



THE SIMPLEST ANIMALS — PROTOZOA 



■ 





&S 



35. Economic Importance. — Paramoecia consume consid- 

 erable quantities of bacteria, but whether more harmful 



than helpful ones cannot 

 be told. Therefore their 

 economic value is un- 

 certain. 



36. Other Protozoa. — 

 If one examines stag- 

 nant water, a large num- 

 ber of other kinds of 

 Protozoa will be found. 

 The more common forms 

 are much like the para- 

 mcecium and have many 

 cilia on the body. 

 Several of these large, 

 ciliated Protozoa feed on the smaller Protozoa. Some of 

 the common forms are shown in Figures 51-53. 



All of these various Protozoa can be grouped into classes, 







Figure 51. — Vorticella. 





m 



i ! S'.-.«. J i\:-i.v.' 



Figure 52. — One of the 

 foraminfera. 



Figure 53. — Some Flagellate 

 Protozoa. 



each with certain distinct characteristics. For instance, all 

 Protozoa that have pseudopodia are called Rhizopoda. In 



