PLATE XXVI 



Figs. 37-38. Anaphases of primary spermatocytes, showing separation of xx 

 and y. In figure 37, the hexad is in linear arrangement; in figure 38, the two 

 x-chromosomes are placed side by side and the y-chromosoms is above. 



Fig. 39. Late Anaphase of primary spermatocyte, the xx-element passing to 

 the upper pole in the figure. 



Figs. 40-41. Sister anaphase plates of cell corresponding to figure 39. In 

 figure 40, the y-element is included ; in figure 41, we see the xx-element. 



Fig. 42. Interkinesis. 



Fig. 43. Metaphase secondary spermatocyte, lateral view. 



Fig. 44. Metaphase secondary spermatocyte, polar view, showing 13 chro- 

 mosomes. 



Fig. 45. Metaphase secondary spermatocyte, polar view showing 12 chromo- 

 somes. 



Fig. 46. Sister cells, secondary spermatocytes, metaphase, polar view: one 

 showing 12, the other 13 chromosomes. 



Fig. 47. Same stage as figure 46, but taken from a smear slide. 



Figs. 48-49. Giant secondary spermatocytes, metaphase, polar view, showing 

 25 chromosomes 



Figs. 50-51. Sister anaphase plates of a secondary spermatocyte (12 chromo- 

 some type), showing exact distribution of chromatin to spermatids. 



Fig. 52. Spermatid, shortly after second meiotic division. 



