Fig. 18. The axial filament passes over the nebenkern, which has slightly 

 elongated. The accessory chromosome is very plain. 



Fig. 19. a shows a surface view, and b an optical section, of a nebenkern which 

 is in process of breaking up. 



Figs. 20 and 21 have part of the surface fibers cut off and show the dark mass 

 forming within. 



Fig. 22. Shows a nebenkern passing from the blackberry stage into the ring 

 stage. 



Fig. 23. This is an end view of the stage shown in figs. 20 and 21. 



Fig. 24. The fainter lines are the fibers on the under side of the nebenkern. 



Fig. 25. The blackberry stage, showing the mass of vesicles. 



Fig. 26. This represents a nebenkern of the stage shown in fig. 7, drawn from 

 a polar view, with adjusting focus. 



