094 J. E. DUERDEN. 
established; (4) after a few moments the disc and tentacles 
recover their normal condition of expansion; (5) the mouth 
remains open until all the nutritive solution is entirely indrawn, 
when it again closes, and both inhalent and exhalent currents 
cease for a time. 
When carmine, sepia, or talcum powder is mixed with the 
nutritive solution similar responses to the above are brought 
about, and the presence of the colouring matter enables the 
course of the solution to be more readily followed. Some of 
the particles remain floating for a short time, and are drawn 
directly down the stomodeum as soon as the inhalent current 
is established, but many of them come to rest on the discal 
Fie. 2.—Diagram to illustrate the flow down the stomodzeum 
of particles resting upon the disc of Fungia when an inhalent 
current is set np. 
surface. The grains of carmine or sepia which fall upon the 
disc are at first scattered somewhat uniformly over the surface, 
but, embedded in slime, they soon become disposed in more 
or less distinct radial streams along the interseptal grooves, 
and, as such, are gently drawn across the disc into the open 
mouth (figs. 2,3). The nutritive solution evidently leads to 
a copious exudation of thin mucus, for sometimes as many as 
a dozen different mucous streams will be slowly moving at 
one time over the disc and down the stomodeum, distributed 
all round the mouth with some degree of regularity. When 
the indrawal of the mucus and its contained particles is com- 
pleted the mouth closes, and the disc is altogether free from 
foreign objects. 
The thin watery character of the mucus making up the 
streams containing nutritive substances is very different from 
its shred or membrane-like nature in the first experiments 
