Fig. 16. — Lateral view of second spermatocyte with an accessory chro- 

 mosome. 



Fig. 17. — Mid-anaphase of second spermatocyte, showing separation of 

 halves of the accessory chromosome. 



Fig. 18. — Similar to figure 17. 



Fig. 19. — Telophase of second spermatocyte, showing presence of the 

 accessory chromosome in daughter-cells. 



Fig. 20. — Telophase of second spermatocyte without the accessory chro- 

 mosome. 



Fig. 21. — Somatic cell in anaphase showing division of the accessory chro- 

 mosome. 



