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Figs. 118-122. — Dioonedule: development of the archegonium: fig. 118, archegoni- 

 um initial; fig. 119, primary neck cell and central cell; fig. 120, the two neck cells; fig. 

 121, nucleus of central cell has divided, forming the ventral canal nucleus and the egg 

 nucleus; fig. 122, mature archegonia showing archegonial chamber; figs. 118-120, X98; 

 fig. 121, X50, fig. 122, X8. — From Chamberlain, The Living Cyca4s'^° (University of 

 Chicago Press). 



