84 MARY T. HAR.MAX AXD FRANK P. ROOT. 



PLATE II. 



FIG. 7. Metaphase plate lateral view of primary spermatocyte showing the 

 precocious and unequal division of the XY-tetrad. 



FIG. 8. Same as 7, except the XY has entirely divided. 



FIGS. 9 AND 10. Anaphase primary spermatocyte. 



FIGS, ii AND 12. Metaphase plate polar view of secondary spermatocyte 

 divisions. 



