12 URNATKLLA eilACILIS. A PBESH-WATiill rOBYZOAN. 
•Ai V flip vpntral wall is colored brown, and probably partakes 
1" hepatic 3ion.‘'Tl,ro„gl.o..t, the stontach « furnished "'■‘'' ‘“S; 
which keep the content, in incessant motion, whirling them from light 
vo„, and then in the reverse course, and m.aintaiiiing the solid materials in the long 
avis of the cavity. The contents of the stomacli, ordinarily seen, consist of an 
elliptical mass occupying the pyloric cavity, with a tapering twisted prolongation 
e.ytending into the main cavity. With this solid food, diaton.es, desn.ids, and other 
vegetable organisms, may often be detected. 
With the exception of the few specimens of Urnatella which were collected the 
last antnmn, those of former collections were remarkable for being .almost invariably 
infested with a ciliated infusorian, living in the stomach. Ihe infusorian, a species 
of Anoplophrija, which I have described under the name of Leiicophri/s socialis, was 
observed in variable numbers, sometimes few, at others in such a multitude as to fill 
the main receptacle of the stomach. They congregate together in the central portion 
of the latter, and together with the food are ke])t incessantly whirling around through 
the ciliary action of the stomach, while they, at the same time, move spontaneously 
among one anotlier in a swarming manner. 
From the lower end of the pylorus, a short, tubular intestine descends, and turns 
inwardly to ex])and in an elliptical pouch or colon. This occupies a position ohlicpiely 
between the lower portion of the stomach, including the pylorus dorsally, and the 
funnel of the polyp-bell ascending from the mouth to the pharynx. Its u])per 
extremity is extended as a short tubular rectum, which terminates just 1k*1ow the 
centre of the funnel converging to the pharynx. 
I he walls of the intestine, including the colon and rectum, are composed of sliort 
coluimiar cpitl.elium, and cxl.il.it no ciliary movements. The colon Is nsimllv oc. iii.icl 
by an cll,pt.cal ,„..ss of excrement, which from time to time is snddcni;- expclh-d 
tliiongh the short rectum and the month of the polyp-bell. 
'fhe long, active cilia of the expanded tentacles of Urnafelh, give rise to a lively 
crclar current the s,.r.o,.„di..g water, which brings particles of fed witl 1 ,hc 
power of be po yp. The food, consisting mahtly of fegLblc matters is 1 cy„ 
Xn-ri't:.:: air- 
ag'.s into the stomach. Here the acn.mi.Iat™ the u-sopl,. 
maintained in position in tlio lonv axis of 1"* 1 '"T’ 
wi,™ the tentacles of 
- of f„o.i i„ ,i,e 
c.n.t.' of tl.e stomacli and in the i.harynx. 
OS, and retracted 
in the stoma 
is still observable within the main 
