PARAMCECIUM. 



Mount a small drop of ivater containing Para- 

 mcecia under a supported cover-glass. Examine 

 first with AA%, and observe where they are most 

 quiet ; then study with D 2. 



I. General Characters. 



1. Form : elongated, flattened, slipper-shaped ; 



the anterior end rounded, the posterior 

 pointed. 



2. Movements : by means of cilia over the entire 



surface. 



3. On the ventral or oral surface an oblique 



funnel-shaped depression (vestibule) which 

 leads to the mouth. Note the direction of 

 the cilia in the vestibule. 



4. A blind sac opening into the vestibule by the 



mouth ; the oesophagus. 



5. At a definite point posterior to the blind end 



of the oesophagus, the anal spot, where 

 waste matters are at times passed out from 

 the body. 



II. Structure. 



1. Ectoplasm : the sharply defined outer layer, 

 with a delicate surrounding membrane, the 

 cuticle. 



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