328 



FAMILY: TRYPANOSOMID.E 



tributed on the spindle, concentrates into the daughter karyosome. 

 Nuclear division is completed by the division of the nuclear membrane. 

 During the whole of this process the nuclear membrane has persisted and 

 enclosed the spindle. Nieschuiz (1922a) has described a similar method 



^ (^ 



i 



Fig. 156. — Nuclear Division ik Trypanosomid.e. (1, Original; 2-3, after 

 NiESCHULZ, 1922; 4, after Citagas, 1909; 5-8, after Hartmann and Noller, 

 1918.) 

 1. Usual apiiearance in wet fixed films stained by iron hajmatoxylin. 

 2-3. Two stages in division of the cultural form of the tryimnosome of the ling-ousel [Turdus 

 torquatvs), showing mitosis of the nucleus ( x 3,000). 

 4. Division of the nucleus of Trypanosoma cruzi by mitosis (x ca. 3,0C0). 

 5-8. Division of cultural forms of Trypanosoma thcilcri, showing mitotic division of the nuclei 

 (X ca. 2,600). 



of division of the nuclei of cultural forms of bird trypanosomes (Fig. 156, 

 2-4). He noted the formation of an equatorial plate which divided to 

 form daughter plates, but was unable to distinguish individual chromo- 

 somes, the plates appearing as dark bands across the spindle. Schulz 



