ARBORESCENT POLY PIERS 



199 



A deeper separation still of the polypi, as well as 

 a greater amount of divergence one from another, 

 brings us back to the arborescent forms assume 1 by 

 the coral. 





.■:^ 



Fig. 39. — Madrepora PLiiitagiuea. 



The dendrophjUia, represented half the natural 

 size (fig. 40), has a massive trunk, l>y which it 



