It 



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. 



__V; nil 



iceba, A, A quarto, ; B, the same killed .and stained ; C, A. proteus ; D, encysted 

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

 ', I, A. proleus, undergoing binary fission ; a, point of union of enclosing 



dS : c. vac. contract, IR vnr-nnlp MI /-Trof f .,, t^A ,r^,,i . 



Fia. 30. Amoeba 



specimen ; _ 



same, stained , *., ^j.. ,,1/1*0,0, uuucigumg 

 pseudopods ; c. vac. contractile vacuole ; 

 (numerous in A. quarta) : psd pseudopod 

 and Howes.) 



tituj jiooiuu , i*, JJVLIUI ui union 01 enclosing 

 V. cyst ; /. vac. food-vacuole ; nu. nucleus 

 From Parker's Biology, after Leidy, Gruber, 



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 



