MANUAL OF ZOOLOGY 



into small masses, each of which becomes a flagellula 

 provided with a flagellum (Fig. n, t J?). 



In most of the Radiolaria there occur in the extra-cap- 

 sular protoplasm minute yellow cells (Fig. 9, z), which 



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multiply independently by binary fission. It has been 

 proved that these are microscopic unicellular plants (Zoox- 

 anthella) of the class Algae, which live in the substance of 



