19 1 2} YAMANOUCHI—CUTLERIA 501 



Fig. 176. — Anaphase, side view. 

 Fig. 177. — Anaphase, further advanced. 

 Fig. 178. — Telophase. 



Fig. 179. — Later telophase: two daughter nuclei in resting condition. 

 Fig. 180. — Two daughter nuclei increased in size: each nucleus has 

 radiations at the poles. 



Fig. 181. — Upper nucleus has grown considerably larger than the lower 



one. 



Fig. 182. — Two nuclei are in contact. 



Fig. 183. — Upper nucleus is in prophase; lower one still in resting condi- 

 tion. 



Fig. 184. — Two nuclei simultaneously in metaphase. 

 Fig. 185. — Anaphase. 



Fig. 186. — Late anaphase: a group of chromosomes at one pole of the 

 upper nucleus is not indicated in this figure. 



PLATE XXXIV 



The formation of the zoosporangium of Aglaozonia reptans (continued) 



Fig. 187. — Telophase of the second division in the mother cell. 



Fig. 188. — Late telophase. 



Fig. 189. — Metaphase of the third division. 



Fig. 190. — Telophase of the same: 8 nuclei present. 



Figs. 191-193. — Zoospore mother cells drawn from unstained preparations. 



Fig. 191. — Nucleus in prophase: numerous granules of various sizes are 

 recognizable; globular structures of larger size are plastids. 



Fig. 192. — Four-nucleate stage: numerous granules still visible; plastids 

 have increased in number. 



Fig. 193. — Eight-nucleate stage: plastids have much increased in number 

 and the thickness of the cell wall at the top of the mother cell is noticeable. 



Fig. 194. — Cross-section of a mother cell at about same stage as in fig. 190; 

 plastids mostly arranged near the cell membrane. 



Fig. 195. — Portion of a mother cell near maturity: thickness of the cell 

 wall at the top of the mother cell has increased; plastids moving toward the 

 nuclei and surrounding them. 



Fig. 196. — Later stage: plastids are around the nuclei. 



Fig. 197. — Portion of a mother cell: cytoplasm has become detached 

 from the cell wall and cleavage furrows have appeared, so that general outlines 

 of individual zoospores are established. 



Figs. 198, 199. — Portion of a mother cell containing zoospores. 



Fig. 200. — Portion of cell wall at the tip of a mother cell after maturity: 

 the cell wall in this part is considerably thickened and swollen. 



Fig. 201. — Later stage: the cell wall at the tip of the mother cell has 

 disintegrated into two lamellae. 



Fig. 202. — Further advanced stage approaching the discharge of zoospores: 

 disintegration has still progressed and broken the cell wall into three lamellae. 



