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Figs. 154-156. — Dioon edule: evanescent segmentation; fig. 154, lower part of em- 

 bryo; fig. 156, diagram of entire embryo; fig. 155, lower part of embryo, showing perma- 

 nent walls at the bottom and free nuclei above; tn, the thick membrane of the egg; fig. 

 154, X200; fig. 156, X20; fig. 155, X108. — After Chamberlain."" 



