170 



COMPARATIVE ANATOMY 



Fig- 36- 



^ofift? saltans. A , an anchored, and 5, a free swimming form showing nucleus, 

 contractile vacuole, and two flagella. C, transverse division of a free 

 swimming form. I), a free-swimming form coming into contact with an 

 anchored form. £, conjugation of the individuals in D, with fusion of 

 the nuclei. /^, triangular zygote resulting from conjugation. G, zygote 

 bursting and emitting spores from three corners. //", young forms 

 developed from the spores. (Modified from Dallinger and Drysdale.) 



Digitized by Microsoft® 



