THE CLOAK ANEMONE. 
129 
•writing this article, Mr. D. Robertson sends me accounts of 
two in his possession, which manifested the same propensity. 
Each first detached the two lobes from the shell, which then 
were thickened, and apparently hollow, »being much dis- 
tended with water. The same evening, both began to 
adhere to the side of the jar in which they were kept, by 
their lateral lobes. Three days afterwards, the lobes were 
“ still firmly and broadly adhering to the bottom and sides 
of the jar.” Mr. Thompson, of Weymouth, has dredged 
a specimen, which was adherent to a frond of Fucus 
serratus. It was round, about as large as a shilling, and 
flat, but “ with the appearance of a suture do’wn one side, 
as though it had joined.” 
Very frequently, there is found intervening between the 
Adamsia and the shell to which it is affixed, a film of 
membrane, of a homy texture, somewhat brittle, of a 
translucent dark greenish-brown colour. After death this 
film is found adherent to the surface of the shell, from 
■vvffiich, however, it easily peels when dry. It invariably 
extends beyond the margin of the lip, making, as it were, 
an adventitious continuation of the shell, and following the 
same general spiral direction. From several specimens 
from the Frith of Clyde, for which I am indebted to the 
kindness of Mr. D. Robertson, I have been able to learn 
the nature and object of this membrane. In one of these 
the shell of Trochus umbilicatus, full-grown and perfect, 
had a great continuation of the membrane into a fictitious 
body-whorl, as voluminous as the whole shell. In another, 
the shell was that of Buccinum undatum, an inch and a 
half in height. Here the membrane was confined to a 
small film, sub-triangular in outline, continuing the front 
margin of the outer lip, and a similar one continuing the 
hind margin of the same ; each tjie production of a lateral 
lobe of the animal, the two not having as yet attained the 
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