PHYLUM PROTOZOA 



47 



conj 11 n«t<- or undergo complete fusion, but nothing is known of the 

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



cast'. 



Fio. 30.— Amoeba. A, A. quarta ; B, the same killed and stained ; C, A. proteus ; D, encysted 

 specimen ; E, A. proteus ;"T\ nucleus of same, stained ; G, A. verrucosa ; H, nucleus of same, 

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

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

 A. quarta) ; psd. pscudopod. (From Parker's Biology, after Leidy, Grubcr, 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 



