58 
ANIMAL LIFE ON THE 
they describe quick sweeping circles, and every now and 
again close and open their branches. This latter feature is 
more characteristic of the small or young ones, which seem 
from their activity to have the largest portion of the work 
to perform; the motion of the larger ones being much slower 
and only partially close their branches, particularly the 
round ones. 
Having thus observed the forms and motions of the 
exterior organs, the following important problems present 
themselves for solution. First, AVhat is the work of the 
pedicellarise ? Second, AVhat are the uses of the fleshy 
tissue or the skin ? Third, What is the work of the spines, 
and how are they produced and those lopped- off by accident 
replaced ? 
Before reverting to the first problem, let us for a moment 
submit the pedicellarise to the scrutiny of the microscope. 
From the first glance, then, we notice that the extended 
portions of the branches are clear and silvery in appearance, 
but following into the middle we see the cells in the 
throat present a cloudy look, and are filled with a watery- 
PEDICELLARLE. 
