INTRODUCTION 1049 



nished with a membrane ; many forms possess nucleus, contractile 

 vacuole and a small groove spoken of as the cytostome. Examples, 

 the trypanosomes and intestinal flagellates. 



CLASS III. SPOROZOA. They live parasitically in the tissues of other 

 animals, ingesting food by osmosis; they have no cilia in the 

 adult stage but may form pseudopoda, one or more nuclei, no 

 contractile vacuole, reproduction by spores. They are divided into 

 two subclasses, telesporidia and neosporidia. Examples, gre- 

 garinida, coccidiidea,, hemosporidia, sarcosporidia, etc. 



CLASS IV. INFUSORIA (Ciliata). The body is generally uniform in 

 shape, with cilia and contractile vacuole, and usually with macro- 

 and micronucleus. Examples, pammecium, balantidium. 



