196 INVERTEBRATE ZOOLOGY 



and in the course of time will die. Conjugation also occurs, as 

 in other Protozoa. The processes of division and conjugation 

 apparently do not take place frequently, as they have not been 

 often observed. 



About a dozen species of the genus Amoeba are known. 

 The commonest are probably A. proteus, a large, often active 

 form with long pseudopodia, A. verrucosa, a large, sluggish form 

 with very short pseudopodia, A. Umax, a small form which flows 

 along without definite pseudopodia, and A. radiosa, a small 

 star-shaped form with slender, radiating pseudopodia. 



