NUCLEI AND KINETIC ELEMENTS 



89 



A modification of this mode of origin of the cytoplasmic kinetic 

 element is shown by Parapolytoma saiurna according to Jameson 

 (1914) and by Oxyrrhis marina (Hall, 1925). In these cases the 

 old flagella and their basal bodies are said to degenerate and dis- 

 appear prior to, or during, nuclear division. An intranuclear endo- 

 basal body which is concealed within an endosome during vegetative 



Fig. 44. — Oxyrrhis 7})arina; details of nucleus, centriole, and paradesmose. 

 (After Hall.) 



life, first divides, its daughter halves forming the poles of the nuclear 

 spindle (Figs. 4.3 and 44). Flagella may either grow out from the 

 substance of the kinetic elements while the latter are still at the 

 spindle poles, or from the endobasal body after the daughter nuclei 

 are established. 



In Bodo lacertcB according to Belar the centrioles after division 

 are taken into the daughter nuclei. Here the kinetic elements, 



