486 Campbell. — Studies on some Javanese Anthocerotaceae. 1 . 
Fig. 41. Longitudinal section of a fertilized archegonium of M. Tjibodensis, containing an 
eight-celled embryo, x 280. 
Fig. 42. An older embryo of the same species, x 285. /-/, the primary wall ; //-//, the 
second wall. 
Figs. 43, 44. Median sections of older embryos of M. Tjibodensis. x 280. The nuclei of the 
archesporial cells are shown. 
Figs. 45-7. A series of four transverse sections of an embryo of M. Tjibodensis , of about the 
same age as the one shown in Fig. 44 ; a is the apex of the embryo. 
Fig. 48. Longitudinal section of a fertilized archegonium of M. Salakensis , containing a four- 
celled embryo, x 280. 
Fig. 49. An older embryo of M. Salakensis. x 280. 
Fig. 50. Two cross-sections of a very young embryo of M. Salakensis. x 280. The divisions 
in the lower section, b, are very irregular. 
Fig. 51. Series of three transverse sections of an embryo of M. Salakensis. x 280. The 
primary wall, /, is indicated in the upper section, a. 
Fig. 52. Median section of a young sporophyte of M. Tjibodensis. x no. The archesporial 
tissue is shaded. 
Fig. 53. The upper part of Fig. 52. x 280. 
Fig. 54. Part of a median longitudinal section of an older sporophyte of M. Tjibodensis , showing 
the extent of the archesporial tissue, sp ; the columella, col ; and the wall-tissues, w. x 280. 
Fig. 55. Median section of young sporophyte of M. Salakensis. x no. 
Fig. 56. Upper part of Fig. 55. x 280. 
Fig. 57. Part of median section of older sporophyte of M. Salakensis. x 280. 
PLATE XLVI. 
Fig. 58. Cross-section of the sporophyte of M. Salakensis at a point where the archesporium 
consists of a single layer of cells ; the nuclei are shown in the archesporial cells, x 280. 
Fig. 59. Archesporium of M. Tjibodensis , showing the first differentiation of the sterile cells, el , 
and the spore-mother-cells, sp. x 280. 
Figs. 60, 61. More advanced stages in the segregation of fertile and sterile cells; Fig. 61 is 
a tangential section, x 280. 
Fig. 62. Section of the sporophyte of M. Tjibodensis , showing nearly ripe spore-tetrads, sp, 
and elaters, el. x 280. col , columella ; w, wall-cells. 
Fig. 63. Spore-mother-cells of M. Tjibodensis , showing the division of the chromatophores. 
x about 900. 
Fig. 64. First nuclear division in spore-mother-cell ; the cell is slightly lobed, indicating the 
position of the spores. 
Fig. 65. Two ripe spores of M. Tjibodensis. x 280. 
Fig. 66. A single spore, more highly magnified. 
Figs. 67, 68. Elaters of M. Tjibodensis. x 280. 
Fig. 69. Section of a ripe spore of M. Tjibodensis. x about 900. 
Fig. 70. Part of the surface of the spore. 
Figs. 71, 72. Elaters of M. Salakensis. x 280. 
Fig* 73 * Two ripe spores of M. Salakensis. x 280. 
Fig. 74. Spore of the same, more highly magnified. 
Fig. 75. Sections of ripe spores, x about 900. b shows the surface sculpturing. 
