HETEROMORPHOSIS 



139 



VII. HETEROMORPHOSIS IN EUDENDRIUM (fiACEMOSUM?) 



Eudendrium (racemosum ?) (Figs. 21a and 216) consists 

 of a main stem which terminates in a polyp at its upper end 

 and in a root at its lower end. The root adheres to solid 

 bodies. Stout lateral branches arise from the stem and 



grow upward. They 

 also carry polyps at 

 their tips. New branches 

 may again arise from 

 these, all of which are 

 directed toward the tip 

 of the main stem. I 

 cut off the tips and roots 

 from stems of Euden- 

 drium and suspended 

 them in part with the 

 tip, in part with the 

 base directed downward 

 in the aquarium. Both 

 ends were surrounded 

 by water. The stem 

 began to grow from the 

 two extremities, and 

 polyps were formed at 



FIG. 2ia FIG. 216 both ends (Figs. 21a 



and 216). All Eudendria became Uapical (just as does 

 Tubularia mesembryanthemum under similar conditions); 

 with this difference, however, that in addition to the new 

 tip, roots were at times formed, at one of the cut ends, which 

 was never the case in Tubularia. 



To maintain the pieces of Eudendrium stems in a vertical 

 position in the aquarium, I pushed them through lead plates 

 in which fine holes had been punched. The plates rested 



