THE CELL 



85 



Apical body or acrosome. 

 Nucleus. 

 End-knob. 

 Middle-piece. 



Erweltps of the tail. 

 .Axial filament, 



End-piece. 



Fig. 

 FIG. 8. Diagram of the flagellate spermatozoon. WILSON. 



Second An apical body, or acrosome lying at the front 

 end of the head, sometimes very minute, sometimes al- 

 most as large as the nucleus and in some cases terminat- 

 ing into a sharp spur by means of which the spermatozoon 

 bores its way into the ovum. 



