CERTAIN GENERAL CHARACTERISTICS 



39 



etally in order from the apical region of the multiaxiate complex and from 

 the apical end of each branch (Fig. 14, A). Later these hydranths degen- 



FiG. 14, A~C. — Reconstitution and degeneration of hydranths in Pomaria cavolinii. A, 

 reconstitution of hydranths after removal progresses basipetally in the whole and in each 

 axis; B, degeneration of hydranths and retraction of coenosarc progresses acropetally; C, the 

 reconstituted axial system at the proximal end persists and grows longer than other parts 

 (from Gast and Godlewski, 1903). 



erate, retraction of the coenosarc in the branches occurs, and the empty 

 parts of the perisarc drop off. These changes progress from the most basal 



