330 



GARY N. CALKINS 



82 83 



Fig. 81 First division metaphase of the amphinucleus ; the chromosomes on 

 ■one side are partly divided. X 3200. 



Fig. 82 Anaphase of the second division after fertilization with two sets of 

 eight chromosomes, and resting nucleus, the other product of the first division. 

 X 3200. 



Figs. 83, 84, and 85 Late telophage stages and final separation of the macro- 

 nucleus-forming second division after fertilization. X 3200. 



Figs. 86 to 90 Stages in the development of the new macronucleus, concen- 

 tration of the fragments of the old macronuclei and their ultimate disappearance, 

 and stages in the concentration of the two new micronuclei. Figure 86 one hour 

 old, the others from 48 hours to 96 hours old. X 800. 



