46 Wisconsin Academy of Sciences, Arts, and Letters . 
here has its maximum volume. The anterior nuclear projec¬ 
tion is longer and the posterior projection is forming. 
14. The cytoplasm has contracted away from the wall. The- 
middle half coil of the nucleus is shown. An edge view of the 
blepharoplast is seen at each end of nucleus. 
15. The nucleus forms one coil. Nucleus is shrinking—the- 
hollow of the coil is larger. Blepharoplast is shown along the 
convex side. 
16. One and a half turns of the spiral. The anterior end of 
the coil is elongating. The cell shows a projection, the anterior 
end of the antherozoid. 
17. Same stage. Side view. Narrow half coil near anterior 
end. Section through posterior tip of nucleus and blepharo¬ 
plast. 
,18. About the same stage. Showing the broad posterior end 
of the nucleus. The narrow anterior end of the cell comes up 
from below on the right. 
Plate 2. 
Figures 19-25. Adiantum Capillus-V eneris. 
Figures 26-31. Aspidium falcatum. 
19. Two coil stage. Longitudinal section through cell. 
Posterior end upward. Nucleus has become condensed to a 
thick band. The cytoplasm is also contracting. 
20. Same stage. Posterior portion of spiral shown. The 
cytoplasm has drawn back into the hollow of the posterior coil. 
21. Two and a half coil stage. Chromatin homogeneous. 
a. Complete, b. Last half coil omitted to show retraction of 
the cytoplasm between last coil and the one next to it. 
22. A single coil from the middle of the antherozoid. The 
cytoplasm now forms a heavy spiral. 
23. Later. Posterior coil and a half. Cytoplasm same. 
24. Mature antherozoid. Cytoplasm forming posterior 
vesicle. Cilia conspicuous near anterior end. 
25. Same. Some cilia directed forwards. 
26. Division of central cell in antheridial sac. Spindle broad 
poled. No centrosome. 
