until they obliterate it and even come to grow out from 

 the lamina itself. Thus there arises a thickened basal 

 portion of the lamina which forms a conical holdfast, as 

 in the other kelps, while new circles of hapteres may be 

 seen on its upper edge, growing out from the undifferen- 

 tiated lamina. By this process the holdfast region ex- 

 tends beyond the bases of the segments of the lamina so as 

 to give the old plant the appearance, not of one, but of 

 several independent laminon springing from a common 

 holdfast. Considering the similarity of the young plants 

 to Egregia, the divergence of the adults is very striking. 



(To be concluded) 



