338 HISTORY OF BRITISH ZOOPHYTES. 
wide apertures are fringed on the upper edge with four or 
five long calcareous spines, which are easily broken off 
when dry, and the mouth is often covered with a pearly 
operculum. It is in all states beautiful; but when a lens 
is applied to it in this pearl-operculated form, it is one of 
the finest objects of a minute nature that can anywhere be 
seen. What human hand would not hang down in despair, 
if required to imitate it; and yet the great UnsueEn teaches 
an almost invisible worm thus elegantly to fashion it. We 
have ten fingers, and they often work wonders. Professor 
Edward Forbes states that this little Ascidian polype has 
from twelve to sixteen, to which we give the name of 
tentacula. 
2, CELLULARIA TERNATA, Dr. David Skene. 
Hab. Sent from Aberdeen, by Dr. D. Skene, to Ellis ; 
Dr. Fleming’s were from Zetland; mine were from Lady 
Keith Murray, Stonehaven, and from Mr. Bean, of Scar- 
borough, at which latter place it is not rare on corallines, 
and sometimes attached to shells. Peterhead, abundant, 
Mr. Peach. 
It is about an inch in height, branching dichotomously ; 
the cells enlarge gradually in breadth towards the top, and 
are armed above with two or three short spines. It takes 
