50 



ANIMAL BIOLOGY 



B. Mastigophora 



The popular phrase "from Amoeba to Man" would lead one to 

 believe that Amoeba and its allies clearly represent the lowest 



Reservoir 



Stigma 



Contractile 

 vacuole 



Chromato- 

 phores 



*$ ## '* £■«• 



Nucleus 



Fig. 22. — Euglena viridis. A, free-swimming individual showing details of 

 structure (from Doflein); B. reproduction by longitudinal binary fission; 

 C, two stages of fission within a cyst. 



group of Protozoa. However, biologists are not sure that such is 

 the case because the great group of flagellated Protozoa, the class 

 Mastigophora, includes many forms that are not only exceedingly 

 simple in structure but also are plant-like in that they possess 

 chlorophyll and so are able to perform photosynthesis. For in- 



