24 
Miyake, The development of the gametophytes etc. 
Fig. 70. A same stage as afcove, showing apollen-tube just reached the 
archegonia. X 50. 
Fig. 71. Outline ot longitudinal section of a similar prothallium as the 
preceding; position of sterile prothallial tissue is shown. X 50. 
Fig. 72. Cross-section of upper part of mature prothallium; sterile pro¬ 
thallial tissue in the center of archegonial complex is shown. X 90. 
Fig. 73—75. Abnormal neck-cells. X 270. 
Fig. 76. A neck seen from above. X 270. 
Fig. 77. Central cell of archegonium in division. X 160. 
Figs. 78—81. Successive stages in division of central cells of arche¬ 
gonium. X 660. 
Fig. 82. Young egg with remnants' of ventral canal-nucleus above. 
X 160. 
Plate IV. 
Fig. 83. Young egg. X 160. 
Figs. 84—86. Mature or nearly mature eggs. X 160. 
Fig. 87. Longitudinal section of upper part of mature prothallium, 
showing mature eggs and sperm-cells ready for fertilization. X 50. 
Fig. 88. Two sexual nuclei little before conjugation. X 270. 
Fig. 89. Sexual nuclei in fusion. X 270. 
Fig. 90. The same. X 660. 
Fig. 91. Beginning of first spindle-formation after fertilization. X 660. 
Fig. 92. Spindle fully established. X 660. 
Fig. 93. Telophase of first division; an extra karyokinetic figure at the 
upper part of egg. X 330. 
Fig. 94. Two daughter-nuclei of first division. X 660. 
Fig. 95. The same at the base of archegonium; an extra nucleus near 
the tip. X 160. 
Fig. 96. The same stage as above. X 160. 
Fig. 97. Four free nuclei at the base of archegonium; only three of 
them are shown. X 160. 
Fig. 98. Eight free nuclei at the base of archegonium; five of them are 
shown. X 160. 
Fig. 99. A slightly later stage. Walls are formed between the nuclei 
and nuclei of upper tier are dividing. X 160. 
Fig. 100. Division of upper tier of eight-celled proembryo. X 660. 
Figs. 100—102. Proembryo after division of nuclei of upper tier. X 160. 
Fig. 103. A little later stage; suspensors somewhat elongated. X 160 
Fig. 104. A still later stage, with longer suspensors. X 160. 
Fig. 105. Abnormal female prothallium in which two archegonial complex 
are present. X 50. 
Plate V. 
Fig. 106 a. Mature body-cell. 
Fig. 106 b. Another section of the same, showing two free nuclei below 
Fig. 107. Two sperm-cells. 
Fig. 108. Longitudinal section of a young ovule, showing young female 
prothallium surrounded by several layers of tapetum cells. Several pollen-tubes 
are seen at the tip of nucellus. 
