II 



PHYLUM PROTOZOA 



47 



have been observed to copulate or undergo complete fusion, but 

 nothing is known of the result of this process or of its precise signi- 

 ficance in this particular case. 



Vx ^> 



31IS^- 



':- i~ ; -V.- . i.i.-:'. :'; -' 



'-'"-. 1 -i ."'- ^' ' ''>,", 



; 



f.yac 



FiO. 30. Amoeba, A, A. quarto, ; B, the same killed and stained ; C, A. proteus ; 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 ; c.y. cyst ; /. 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 



