193 



Fig. 79. Two spermatogeiiic cells of 0. 

 mulucccDium, before the final divi- 

 sion; bl. the two blepharoplasts; 

 x950. 



Pigs. 80—83. Development of the sper- 

 matozoid in 0. moluccanum, x950; 

 Fig. 83 shows the separate biepha- 

 roplast with the cilia. In Fig. 80, b, 

 the blepharoplast is shown in section. 



Fig. 84. Sperraatogenic cell of 0. pen- 

 dulum befoje the final division, 

 x950. 



Fig. 85. La.st division in the sperma- 

 togenic cell, showing the very large 



nuclear spindle; bl, the blejiharo- 



plasts, x950. 

 Fig. 86. Transverse .section of the nuclear 



plate, showing the vei'y numerous 



chromo.'^omes, x95n. 

 Figs. 87—93. Development of the sper- 



matozoid of 0. peiuliilum, x950, bl, 



blepharoplast; c, cilia. 

 Fig. 94. Nucleus from a nearly mature 



spermatozoid, x950. 

 Fig. 95. Three spermatozoids from sections 



of open antheridia, x950; v, the 



cytoplasmic vesicle. 



PLATE XV. 



All figures of 0. pendulum. 



Fig. 98. Two spermatozoids from an 

 open antheridium, mateiial fixed with 

 Flemming's solution ; x950; bl, blepha- 

 roplast; n, nucleus; v, vesicle. 



Fig. 97. Transverse section of the apex 

 of a prothallial bi-anch, x275, x, 

 apical cell; ?, young archegonium. 



Figs. 98 — 108. Longitudinal sections, 

 showing the development of the 

 archegonium, x275; b, basal cell; n, 

 neck canal cell; v, ventral canal cell. 



Fig. 107, an archegonium with two 

 neck canal cells. 



Fig. 1C9. An open archegonium showing 

 a spermatozoid within the neck canal. 



Fig. 110. An oblique section through an 

 archegonium, showing the recently 

 formed ventral canal cell, v, xG50. 



Fig. 111. A similar section, the ven- 

 tral canal cell somewhat distended; 

 n, one of the neck canal cell nuclei; 

 x650. 



PLATE XVL 



Figs. 112, 113. Two longitudinal sec- 

 tions of old archegonia of moluc- 

 canum, x275. 



Fig. 114. Transverse section of the 

 venter of a similar archegonium. 



Fig. 115. Section of an archegonium of 

 0. pendulum, which has just been 

 fertilized; x275. A spermatozoid, sp, 

 has penetrated the nucleus of the 

 egg; other spermatozoids in the neck 

 of the archegonium. 



Fig. 116. Two-celled embryo of 0. moluc- 

 canum; x275; ar, neck of arche- 

 gonium. 



Fig. 117. Nearly median longitudinal 



section of an older embryo of 0. 

 pendulum, x275. I — I, the basal wall; 

 1", apical cell of root. 



Fig. 118. Two tiansverse sections of a 

 four-celled embryo, x275. 



Fig. 119. Two oblique sections of a five- 

 celled embryo, x275. 



Fig. 120. Nearly median longitudinal 

 section of an older embryo, xUO: r, 

 the root. 



Figs. 121 — 123. Three transverse sec- 

 tions of an embrj'o of about the 

 same age as the one shown in Fig. 

 120, x275. 



PLATE XVn. 



Fig. 124. Nearly median longitudinal 

 section of an older embryo of 0. 

 pendulum, x65; r, the root. 



Fig. 125. An older embryo of the 

 same type, xG5; f, foot; r-, second 

 root. 



