FLAGELLATA 



117 



the zygote encysted ; and within the cyst the protoplasmic body 



nu c.vac 



fl.l' 



Fig. ^i.-Bodo saltans. A, the positions assumed in the springing movements of t e 

 . anchored form ; B, longitudinal fission of anchored forms ; C, t'^^.7™'-=';f^^'™;"/'^ 

 same ; D, fission of free-swimming form ; E'-E^ conjugation of fr^^^^'^™'" ' SJ"*^ 

 anchored form ; E^ zygote ; E^ emission of spores froni zygote ; F, growth of spores 

 c.vac, contractile vacuole ; fl.l, anterior ; fl.2, ventral flagellum ; nu, nucleus. 

 (From Parker's Biology, after Dallinger.) 



underwent brood-formation, the outcome of which was a mass of 



