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EXPLANATION OF PLATES XLIX-LIII. 
Illustrating Dr. Lewis’s paper on Griffithsia Bornetiana. 
Lettering of figures : a.n., auxiliary nucleus ; aux., auxiliary cell ; b.c., basal cell ; carp., carpo- 
gonium or carpogenic branch ; c.c., central cell ; fn., fusion nucleus ; p.c., peripheral cell ; pi., 
placenta; pl.c ., placental cell; sp.c., sporogenous cell. 
PLATE XLIX (Figs. 1-26). 
Fig. 1. Small specimen, female plant, x 2. 
Fig. 2. Portion of male plant, showing caps of antheridia over the tips of the terminal cells, 
and hairs, x 30. 
Fig. 3. Portion of female plant with cystocarps. X 30. 
Fig. 4. Portion of tetrasporic plant with tetraspores. x 30. 
Fig. 5. Optical section of the wall of a single cell, on the left from near the apex, on the right 
from the base, showing characteristic lamination, x 1800. 
Fig. 6. Longitudinal section through an intercellular connexion, x 700. 
Fig. 7. Section showing accumulation of nuclei and cytoplasm on the wall, x 1200. 
Fig. 8. Transverse section through an intercellular connexion, showing the pore surrounded by 
nuclei ; among the nuclei are deeply staining balls of proteid. x 700. 
Fig. 9. Surface view of an apical cell, in which all the nuclei are undergoing division, x 500. 
Fig. 10. Resting nucleus from a tetrasporic plant ; around it are chromatophores. x 1800. 
Figs. 11-26. Stages in mitosis of nuclei from tetrasporic plant. All x 3600. 
Figs. 11-18, prophases; 19, metaphase showing spindle, chromosomes, and kinoplasmic caps; 
20, polar view of equatorial plate ; 21-23, anaphases ; 24-26, telophases. 
