222 



BIOLOGY OF THE PROTOZOA 



division always occurring after the daughter cells have separated 

 (Fig. 105). 



The micronuclei show no such complicated histories. If they are 

 multiple in the cell there is no fusion, nor is there anv elimination 



Fig. 105. — Uroleptus mohilia. Division stages after fusion of the macronuclei. 



(After Calkins.) 



of micronuclear material. Each divides with the formation of an 

 unmistakable but very minute, mitotic figure (Fig. 22, p. 57). 

 They are all represented furthermore by daughter halves in each of 

 the daughter cells. 



