Campbell. — Studies on some Javanese A nthocerotaceae. I. 485 
EXPLANATION OF PLATES XLIV-XLVI. 
Illustrating Professor Campbell’s paper on Anthocerotaceae. 
PLATE XLIV. 
Fig. r. A rather small plant of the typical Megaeeros Tjibodensis , with two young sporophytes, 
sj>. x 2. 
Fig. 2. An older sporophyte, showing the long involucre, in. x 2. 
Fig. 3. A ripe sporophyte removed from the involucre. Natural size. 
Fig. 4. A plant of M. Salakensis , with two young sporophytes. x 2. 
Fig. 5. Ripe sporophyte of M. Salakensis. x 2. 
Fig. 6. Margin of the thallus of the typical M. Tjibodensis. x 25. 
Fig. 7. Margin of the thallus of a larger form of the same, x 25. 
Fig. 8. Margin of thallus of M. Salakensis. x 25. 
Fig. 9. Cells from upper surface of M. Tjibodensis , showing the chromatophores. x 280. 
Fig. 10. Cells from the lower surface of the same species. 
Fig. 11. Cell from the interior of the thallus of M. Tjibodensis , showing twelve chromato- 
phores. x 280. 
Fig. 12. Cell from the interior of the thallus of a form growing with M. Tjibodensis , but 
showing a different type of chromatophore. x 280. 
Figs* I 3- I 7* Chromatophores of M. Salakensis. x 280. Fig. 13, cells from upper surface; 
14, from lower surface ; 15, a sub-epidermal cell ; 16, 17, inner cells, n , the nucleus. 
Fig. 18. Cell from the interior of the thallus of M. jlavens (Spruce), x about 500. 
Fig. 19. Cell from the interior of the thallus of M. Vincentianus (Lehm. and Lindenb.). 
x about 500. 
Fig. 20. Longitudinal section of the apex of the thallus of M. Tjibodensis. x 280. <j>, a young 
archegonium. 
Fig. 21. Apical region of M. Tjibodensis , showing an approach to the type of Dendroceros. 
Fig. 22. Longitudinal section of the thallus of M. Tjibodensis, showing the relative position of 
the antheridium, <J, and the archegonium, <j> ; the latter contains a young embryo ; N> Nostoc 
colony, x 25. 
Figs. 23-5. Development of the young antheridium of M. Salakensis , seen in longitudinal 
section, x 480. b , the basal cell. 
Fig. 26. The outer cells of the antheridium shown in Fig. 25. 
Fig. 27. Young antheridium of M. Salakensis in which the antheridial chamber is open on one 
side, x 480. 
Fig. 28. An older stage of the same species, x 280. 
Fig. 29. Two sections of a nearly ripe antheridium of M. Salakensis . x 280. 
Fig. 30. Nearly ripe spermatocytes, x about 900. 
PLATE XLV. 
Fig. 31. Median section of a nearly ripe antheridium of M. Tjibodensis. x 280. 
Fig. 32. Cross section of the pedicel of the antheridium. 
Figs. 33, 34. Two very young archegonia of M. Tjibodensis , longitudinal sections, x about 
600. In Fig. 34 the outer cell had divided by a longitudinal wall before the separation of the 
primary neck canal cell had taken place. 
Figs. 35, 36. Two older stages of the archegonium. x 480. In the one shown in 36 there 
were four cover cells. 
Fig. 37. A nearly ripe archegonium of the same species. x 280. 
Fig. 38. Cross-section of the venter of a young archegonium. x 480. 
Fig* 39* Two cross-sections of the upper part of the neck of a nearly ripe archegonium. x 280. 
Three cover cells, d, are present. 
Fig. 40. A mature archegonium of M. Salakensis. x 280. 
