PHENOMENA ACCOMPANYING FERTILIZATION 523 



ous chromatin «f the resting micronucleiis. The process is com- 

 pleted at the parachute stage and the definitive number is present 

 by the time the second pole of the spindle is completed. In IroJep- 

 his molUis when diffusion of the granules has apparently reached 



p — 



^\ 



•"••s 



re>- 



V 



fV 



Fig. 216. — Didinium nasutum, section of conjugating individuals. Second meiotic 

 division of the nuclei (P). (Original.) 



its limit, there are from 24 to 28 chromomeres (Fig. 36). Prandtl's 

 figures show that there are approximately 32 in Didinmm nasutum. 

 Enriques (190S) and Collin (1809) have described a similar frag- 

 mentation of the comma-shaped chromatin rod of Chilodon uncinatus 



