12 



THE FOEAMINIFERA 



cell-contents giving rise to independent organisms. 

 This latter process, however, seems rare in the 

 Foraminifera. 



Fig. 9. — Stages in the Longitudinal Fission of a 

 Flagellate Monad — Dallingeria Drysdali. 



x = nucleus. 



Protozoa are distinguished from the other and 

 higher groups of animal organisms, sometimes collec- 





>Mm:y 







0^^ 



■J 



....-^0 





0; 



^ 



g. ,-^.. 





^ . ^-v^.'P^. .g^- 





/ > 



/ '//pi w 



Fig. 10. — Karyokinetic Division of the Nucleus in Acanthocystis. 



After Scliaiidlnn. 



tively termed metazoa, by the absence of any struc- 

 tures resembliuQ- the oro-ans and tissues of the higher 



