AMCEBA. 



Mount some of the water or sediment containing 

 amoebae under a large cover-glass. /Search for 

 them with the low poiver, and when found study 

 tvith the high poiver. Observe : 



I. General Characters. 



1. Form : in the motile state characterized 

 by irregularity and continual change ; 

 rounded processes (pseudopodia) formed by 

 the protrusion and the retraction of the 

 protoplasm. 



II. Structure. 



1. An outer transparent layer : the ectoplasm. 



2. An inner more granular layer : the entoplasm. 



3. A spherical or disk-shaped body in the ento- 



plasm : the nucleus. 



4. A spherical space filled with fluid, disappear- 



ing and reappearing at intervals ; the 

 contractile vacuole, often situated in the 

 hinder part of the body. If the pulsations 

 can be readily observed, describe them. 



5. Water-vacuoles (not always present) : in the 



entoplasm. 



6. Food masses in food-vacuoles in the ento- 



plasm. 

 Sketch an amoeba ( X 8 or X 10). 



