220 



BIOLOGY OF THE PROTOZOA 



fragments would be different. The anterior fragment of a Stylo- 

 nychia or Uronychia, for example, would retain the highly differen- 

 tiated parts about the mouth while the posterior part would be 



® 



Fig. 110. — Uroleptus mobilis. Division stages after fusion of the macronuclei. 



(After Calkins.) 



relatively undifferentiated. The finer organization or genotype, 

 however, is represented by all of the protoplasm of the cell, and 

 that organization has the ability under proper stimulation, of form- 



