THE EMBRYO AND SEEDLING 



123 



The free nuclear period is common to all cycads, and 

 the earlier divisions seem to be nearly identical in all the 

 species I have been able to investigate; but after the 



Fig. 63. — Dioon cdulc: a late free nuclear stage in the development 

 of the embryo. The remains of the ciliated band are shown at h. Highly- 

 magnified. 



