THE HIGHER CRYPTOGAMIA. 317 



wards, and pierces through the prothallium. Towards the 

 base of the central cell of the archegoniura the rudiment of 

 the embryo is developed into a rounded inconspicuous 

 swelling, consisting of wide cells filled with amylum. 

 This swelling is the continuously-developing primary axis 

 of the embryo. 



