20 



GENERAL ORGANIZATION OF THE PROTOZOA 



colonies. A gregaloid colony arises by the adventitious union of 

 previously separated cells. Thus, many of the so-called "agglomera- 



FiG. 3 



A^::^^^^!^. 





^ 





€t 



© 





t) P. - 



,:& 



® '^-^ -^^tf^ 



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s*.^ 



<^<^f-^, 



^^ -- r~<?^ e^ ^ ^ t. '' -<5 



C^^^^-^f :^-. ^ e t) « €>• 



Uroglena americana, Calkins, a spheroid colony, consisting of monads embedded 



in a gelatinous matrix. 



O C^ O . ; o cs <3 ®-~-^ 



Fig. 4 



Codosiga cymosa Sav. Kent, an arboroid colony of Choanoflagellates. (After Kent.) 



tions" of spirochetes and trypanosomes are gregaloid colonies brought 

 about by some adverse condition of the environment. A spheroid 



