Fig. 38. The nebenkern appears as a hanging drop on the side of the axial filament.
Fig. 39. The nucleus has condensed, the walls have thickened, and the chromatin appears in granules. The acrosome is pointed.
Fig. 40. A little later stage than 39.
Fig. 41. A little later stage than 40.
Fig. 42. The head is stained intensely, while the acrosome is lighter. Probably a middle piece indicated.
Fig. 43. The head shows the clear space.
Fig. 44. Cross-sections of the head, of the stage shown in fig. 43.
Fig. 45. The head and part of the tail of a mature spermatozoon.
PLATE III.