124 Proceedings of Indiana Academy of Science. 
EXPLANATION OF FIGURES. 
Fig. 1. Initial of imbedded archegonium. 
Fig. 2. Completely formed imbedded archegonium. 
Fig. 3. Two imbedded archegonia with axial rows reversed. 
Fig. 4. Imbedded antheridium. 
Figs. 
Figs. 
and 6. Abnormal embryo-sacs of Lilium. 
and 8. Abnormal sexual branches of Vaucheria geminata. 
Fig. 9. Abnormal megaspore tetrad of Selaginella. 
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