32 CYTOLOGY CHAP. 



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



FIG. 14. 



Meiotic Phase in the male Tomopteris oniscijformis. (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, diakmesis ; K, nuclear membrane disappeared ; immediate prophase of meiotic I. ; L, metaphase I. ; M, 

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



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

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



