102 Campbell.— Studies on some Javanese Anthocerotaceae. II. 
Fig. 13. Transverse section of the apex of the archegonium, showing three cover-cells, d. 
x 280. 
Fig. 14. Longitudinal section of an antheridial shoot of A. X 25. n } Nostoc colony; M, 
mucilage cavities; o 77 , antlieridia. 
Figs. 15-17. Development of the antheridium in A. x 280. 
Fig. 18. Spermatogenic cells after the last division. x about 600. 
Fig. 19. Ripe antheridium of A. x no. /, section of the pedicel. 
Fig. 20. Young antheridium of B. x 280. 
Fig. 21. An older antheridium of B. X 280. 
Fig. 22. Ripe antheridium of B. x no. 
Fig. 23. Two longitudinal sections of a two-celled embryo of A. x 280. 
Fig. 24. An 8-celled embryo of A. x 280. 
Fig. 25. Three transverse sections of a 6-celled embryo of B. x about 600. a, apex; 
c, base. 
Fig. 26. Two longitudinal sections of a young embryo of B. X 280. The separation of 
endothecium and amphithecium is complete. 
Fig. 27. Median longitudinal section of an older embryo of A. x 280. The archesporial 
tissue has the nuclei shown. 
Fig. 28. Longitudinal section of the young sporophyte of A, showing the extent of the 
archesporial tissue, sf>; the columella, col; f, the foot, x 65. 
Fig. 29. Transverse section near the base of the young sporophyte of A ; the archesporial 
cells have the nuclei shown, x 280. 
Fig. 30. Section of ripe spore tetrad of A, showing the cell-divisions in the spores, x 280. 
Fig. 31. Fragment of a ripe elater. x 280. 
PLATE X. 
All figures refer to Notothylas javanicus , N. ab E. 
Fig. 32. Longitudinal section of the apex of the thallus with a nearly mature archegonium, ? ; 
x, apical cell, x 280. 
Fig. 33- A similar section, with young archegonium. x 600. 
Fig. 34- An abnormal archegonium with the egg-cell divided into two. x 480. v, ventral 
canal-cell. 
Fig. 35. Nearly mature antheridium. x 2 So. 
Fig. 36. Two-celled embryo, x 480. 
Fig. 37. An older embryo, x 480. //, first transverse wall ; en , one of the primary endo- 
thecium-cells. 
Fig. 38. Median longitudinal section of an older embryo; the archesporial cells show the 
nuclei, x 280. 
Figs. 39-41. Five transverse sections of an older embryo, x 280. a , b } through the foot; 
c, d , nearly median sections ; c , above the summit of the columella. 
Fig. 42. Transverse section of an older embryo, showing but three rows of cells in the 
columelia. x 280. 
Fig. 43. Median longitudinal section of young sporophyte. X 280. The archesporium is 
shaded. 
Fig. 44. Median longitudinal section near the base of a large sporophyte ; col , columella ; sp, 
fertile ; el } sterile cells of the archesporium. x 280. 
