AFFINITIES OF DAVIDIA INVOLUCRATA. 335 
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EXPLANATION OF THE PLATES. 
Abbreviations.—ant.—antipodals ; e.sac—embryo-sac ; en.—endocarp; end.-- endosperm ; i.ep. — internal 
epidermis ; inf.—integument; m.sp.— megaspore ; m.sp.m.c. = megaspore-mother-cell ; 
nu.ep. — epidermis of nucellus ; nu.cap —nucellar cap ; 008.=oosphere ; pr o-emb. = pro- 
embryo; sus.=suspensor ; syn.=synergids ; A=central cylinder in transverse 
section. 
PLATE 31. 
Fig. 1. Young inflorescence (enlarged). 
Figs. 2-4. Stages in the development of the hermaphrodite flower (enlarged). 
Figs. 5-12. Stages in the development of the fruit (5 & 6 enlarged ; 7-12 nat. size). 
Fig. 13. Seeds. 
Figs. 14-17. Stages in the development of the sporogenous tissue. X 600. 
F igs. 18, 19, 21. Development of more than one megaspore. X 600. 
Figs. 20, 22, 24. Abnormal embryo-sacs. x 600. 
Fig. 23. Embryo-sac just prior to fertilization. x 600. 
Fig. 25. Two cells of four-celled pro-embryo. x 600. 
Figs. 26, 27. Later stages in the development of the pro-embryo. X — 
