41S 



BIOLOGY OF THE PROTOZOA 



ded in masses of jelly (Spongomonas, Phalansterium). Amongst 

 parasitic forms many species show both simple division and multiple 

 division, during which nuclei and kinetic elements divide two or 



Fig. 177. — Arboroid colony of protomonads, Poteriodendron petiolatum. 



more times without division of the cell body (somatella formation). 

 In rare cases such phenomena are accompanied by the formation of 

 a cyst membrane and the process becomes a typical sporulation 

 (Fig. 122, p. 234). 



