THE AMCEBA, HYDRA, AND OTHER SIMPLE ANIMALS 115 



body protoplasm they are digested, the undigestible parts 

 being forced out through the surface of the body. Note 

 within the body an oval transparent spot which shows 

 no pulsations. This is called the nucleus and is charac- 



3 



Fig. 79. — Ai>icelfa sp. ; showing the forms assumed Ijy a i-iui^lc iudiviJual 

 in four successive changes. (Greatly magnified; fnjmhfe, ) 



teristic of all cells. Make drawings showing Amoeba in 

 three different shapes. 



Amoeba produces young Amcebae by simply dividing in 

 halves, half of the nucleus going with each half of the rest 

 of the protoplasm. Each half begins at once to move about 

 and to feed and behave just like the parent, soon growing 

 to be as large as the original Amoeba. In this simple 

 way of producing young the parent does not die at all, 



