IOO 



PAULINE H. DEUERER. 



break up into shorter elements, and to become somewhat more 

 disentangled from one another, as figured in Nos. 14 and 15. 

 In the latter the plasmosome is not in the plane of section. In 

 Fig. 16 this fragmentation has become more marked, until in Fig. 

 17, the spireme is transformed into thirteen pieces, of irregular 



\ 



11 1 



1 / 



\\\V 



31 







;//./ 



1 1 



w 



m 





33 



34 



Figs. 30-35. First spermatocyte division. 



Fig. 30. Prophase (two chromosomes lacking in this section). 



Figs. 31, 32. Polar views of metaphase groups showing 13 chromosomes. 



Figs. 33, 34. Side views of anaphase (not all the chromosomes are shown). 



Fig. 35. Telophase. 



shape and outline, which are more granular and stain less in- 

 tensely, than the previous stages. (The plasmosome does not 

 appear in this section.) In Fig. 18 the limit of spireme frag- 

 mentation has been reached. Thirteen chromatin elements 

 appear, one of which is denser than the others. The plasmo- 

 some is characteristically bipartite in this and later stages. 



