46 H. L. WIEMAN. 



Plate II. 



Fig. II. Side view of the second spermatocyte spindle at metaphase. 



Figs. 12 and 13. Polar views of the second spermatocyte spindle at metaphase 

 showing 12 chromosomes. 



Fig. 14. Second spermatocyte spindle at late anaphase showing a free polar 

 body near the upper end of the cell. 



Fig. 15. Second spermatocyte at telophase with a polar body attached to the 

 upper daughter cell. 



Fig. 16. Early spermatid, reconstruction of the nuclei. Polar body fragments 

 near the upper cell. 



Figs. 17 and 18. Stage in the transformation of spermatids into spermatozoa. 



Fig. 19. Metaphase chromosome group in the mitosis of a developing wing, 

 showing 12 chromosomes. Young male pupa. 



Figs. 20, 21 and 22. Metaphase chromosome groups of ovarian follicle cells, 

 showing 13, 14 and 13 chromosomes respectively. Late female larva. 



