PHYLUM PROTOZOA 



47 



conjugate or undergo complete fusion, but nothing is known of the 

 result of this process or of its precise significance in this particular 

 case. 



A /-: B 



FIG. 30. Amoeba. A, A. quarta; B, the same killed and stained ; C, A. protein ; D, encysted 

 specimen ; E, A. proteus ; F, nucleus of same, stained ; G, A. verrucosa ; H, nucleus of same, 

 stained ; I, A. proteus, undergoing binary fission ; a, point of union of enclosing pseudopods ; 

 c. -vac. contractile vacuole ; cy. cyst ; f. vac. food-vacuole ; nu. nucleus (numerous in 

 A. quarta) ; psd. pseudopod. (From Parker's Biology, after Leidy, Gruber, and Howes.) 



2. CLASSIFICATION AND GENERAL ORGANISATION. 



The . Rhizopoda differ among themselves in the character of 

 their pseudopods, which may be short and blunt or long and 



