HEREDITY IN THE PROTOZOA 



291 



Hegner has studied similar problems on another 

 form, Arcella dentata (Fig. 68), in Jennings' labo- 

 ratory, and has fully confirmed Jennings' and 

 Middleton's results. Hegner has made a number 



l''iti. <)!). — ^Arcella dentata. A. mononucleate individual. />, non- 

 ruicicite, and (\ hinticleafc individual, products of division of inono- 

 nuclcatc individual. />>, d(\scendatit, and I'J, later descendant of (', aj)- 

 proaching normal size. (^.\fter Hegner.) 



of other experiments and observations that htive a 

 bearing on the infkience of th(> tuicIcm and of the 

 chromidial net of Arcella. In one sj^ecies, A. dentata, 

 there are two nuclei situated opposite to each other 

 as seen in A, Fig. 68. If an individual is cut in 



