130 



'RUTOZOOLOGY 



chromosomes which become thicker and shorter move toward 

 each pole. During the telophase, each chromosome spHts length- 

 wise and forms the resting nucleus (g). In Lophotnonas blattarum, 

 the nuclear division (Fig. 59) is initiated by the migration of the 

 nucleus out of the calyx. On the nuclear membrane is attached the 

 centriole which probably originates in the blepharoplast ring; 



Fig. 59. Nuclear division in Lophomonas blattarum, X1530 (Kudo), 

 a, resting nucleus; b, c, prophase; d, metaphase; e-h, anaphase; i-k. 

 telophase. 



the centriole divides and the desmose which grows, now stains 

 very deeply, the centrioles becoming more conspicuous in the 

 anaphase when new flagella develop from them. Chromatin 

 granules become larger and form a spireme, from which 6-8 

 chromosomes are produced. Two groups of chromosomes move 

 toward the opposite poles, and when the division is completed, 

 each centriole becomes the center of formation of all motor 

 organellae. 



