EUGLENA 



167 



place, or, at any rate, to fulfil the functions, of the centrosomes 

 in normal mitoses. Previous to division, the flagellum of 



J3 



C 



Fig- 35- 



Mitosis in Euglena. A, elongation of the nucleocentrosome, radial arrangement of the 

 chromosomes. B, further elongation of nucleocentrosome ; pennate arrangement 

 of chromosomes. C, chromosomes arranged in a ring round the dumb-bell-shaped 

 nucleocentrosome. D and E, the chromosomes split and their halves travel in 

 opposite directions. F, final stage of mitosis. G, reconstitution of the daughter 

 nuclei. (After Keuten.) 



Euglena is doubled; not, it would appear, as the result of the 

 splitting of the original flagellum, but by growth of a new one. 



