SEX IN PROTOZOA 



237 



24\: 



Fig. AJ. Nuclear divisions in conjugation of Euplotes patella, from Turner 



(1930), redrawn. 



1-8, first (extra) pregametic micronuclear division showing eight chromosomes; 9-16, 

 second pregametic (first meiotic) division, "parachute" stage at 13, thirty-two gran- 

 ules in metaphase (15), sixteen going to each pole (16); 17-20, third pregametic 

 (second meiotic) division, "reduction" takes place; 21-24, fourth pregametic division 

 with four chromosomes dividing. 



