32 CYTOLOGY chap. 



chromosome areas lose their identity, is obviously a very difficult one to 







Var 



K 



% \ 



N 



3 



» 



f\ 



4)*. 



/ 





msif 



p ^ 



m'ii* 



Fig. 14. 



Meiotic Phase in the male Tomopterh onisciformis. (After A. and K. E. Schreiner, A.B., 1906.) 

 A, B, telophases of last pre-meiotic (spermatogonial) mitoses ; C, late telophase of same, passing into 

 primary spermatocyte ; D, leptotene stage ; E, F, G, zygotene stage ; H, pachytene stage ; I, diplotene stage ; 

 J, dialanesis; K, nuclear membrane disappeared ; immediate prophase of meiotic I. ; L, metaphase I. ; M, 

 anaphase I. ; N, prophase IT. ; O, metaphase 11. ; P, telophase II. 



estabhsh. Wilson, however (1912), who examined the Schreiners' own 

 material, is incUned to agree with them on this point. 



