FLAGELLATA 



117 



the zygote encysted ; and within the cyst the protoplasmic body 



nu c.vac 



Fig. 38. Bodo saltans. A, the positions assumed in the springing movements of the 

 anchored form ; B, longitudinal fission of anchored forms ; C, transverse fission of the 

 same ; D, fission of free -swimming form ; E^E 4 , conjugation of free-swimming with 

 anchored form ; E 5 , zygote ; E 6 , emission of spores from zygote ; F, growth of spores : 

 c.vac, contractile vacuole; Ji.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 



