CHAPTER IV 

 AMEBA 



(Ameba proteus Leidy) 



Ameba proteus (Fig. 9) is a one-celled animal about .25 mm. 

 ( T ^g- inch) in diameter, and is, therefore, invisible to the naked eye. 

 Under the compound microscope it appears as an irregular color- 



FIG. 9. Ameba proteus . i, nucleus ; 2, contractile vacuole ; j, pseudopodia, 

 dotted line leads to ectoplasm ; 4, food vacuoles ; 5, grains of sand. 

 (From Shipley and MacBride after Gruber.) 



less particle of animated jelly which is constantly changing its 

 shape by thrusting out finger-like processes (Fig. 9, j). 



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