312 J. E. WODSEDALEK. 



PLATE III. 



FIGS. 19-25. Metaphase stages of division of primary spermatocytes showing 

 the passing of the sex-chromosome to one pole in advance of the other chromosomes. 



FIGS. 26 AND 27. Late anaphase stages of division of primary spermatocytes 

 showing eighteen chromosomes at one pole and eighteen plus the sex-chromosome 

 at the other. 



