HETEROMORPHOSIS 139 
VII. HETEROMORPHOSIS IN EUDENDRIUM (RACEMOSUM ?) 
Eudendrium (racemosum?) (Figs. 21a and 21b) 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. Newbranches 
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 
ake- two extremities, and 
s). polyps were formed at 
FIG. 21a FIG, 21b both ends (Figs. 21a 
and 21b). All Hudendria became biapical (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 
Digitized by Microsoft® 
