174 



PROTOZOA 



B 



FIG. 122. Clathndina elegans. A, with extended pseudopodia; B, divided into two 

 cysts; C, zoospore; n, nucleus; CT, contractile vacuole. 



Sl^Jllw 



FIG. 123. Encystment of Actinospharium, schematized to the extent that in III 

 and IV, successive stages are shown in the same figure. I, just encysted animal; 

 II, formation of the primary cysts, after resorption of most of the nuclei; III, i and 2, 

 division of primary into secondary cysts; 3, 4, maturation of secondary cysts; 3, forma- 

 tion of first, 4, of second polar globule, 5, fusion of secondary cysts (autogamy); 

 IV, 1-4, stages of conjugated cysts; 5, escape of young Actinosphoerium. 



