MECHANISM IN SEOEEOATION 



45 



die, each half of each chromosome becoming attached by 

 a spindle fibre to one pole (Fig. 18, ^). The halves move 



Fig. is. Last spermatogonial division of Tomopteris, a-k; stages before and during 



synapsis, i-l. (After Schreiner.) 



apart towards their respective poles (Pig. 18, e) and as 

 they become separated into two groups the cell protoplasm 



