REPRODUCTION 



221 



are distributed in the cytoplasm. When each of the nuclei is thus 

 freed from its distal portion the eight remaining parts fuse together, 



Fig. IM.— Uroleptus mobilis. Stages in the fusion of the macronuclei prior to cell 

 division; micronuclei in mitosis. (After Calkins.) 



forming first a long banded nucleus, and later, by condensation, a 

 relatively small ellipsoidal and single nucleus. This divides twice 

 or three times before the division of the cell is completed, the fourth 



