298 
ZOANTHIDJi:. 
Tentacles. Twenty-eight (twenty-four in less mature specimens), arranged 
in two rows, fourteen in each : those of the inner row correspond to the 
marginal teeth, those of the outer are intermediate. They are sub-equal, 
taper, bluntly pointed, and, when extended, about equal in length to the 
diameter of the column, hollow, not warted, with thick walls, which, in 
contraction, fall into transvei’se or annular corrugations. They are pro- 
truded in a brush, but, when fully expanded, spread out horizontally. 
Mouth. Lip sharp, much crenated, protruded after feeding. 
Colour. 
Investment of root-hand and column. Pale brown, the hue of the sand. 
Column. Beneath the investment, transparent and colourless. 
Disk. Pellucid reddish-grey, dusted with excessively minute white 
specks. 
Tentacles. Ti’anslucent, nearly colourless ; but each has a small mass of 
opaque white pigment on the internal surface, just at the tip : the aggre- 
gation of white points has a pretty effect. 
Mouth. Lip opaque white. 
Size. 
Xone that I have seen alive exceeded one-eighth of an inch in diameter, 
and about thrice that height in extension. In contraction the button is 
usually about a line in height, ilr. Holdsworth has obtained specimens 
much larger than these. 
Locality. 
The extreme northern and southern points of the British Islands, North- 
umberland, and various other points of our coast ; deep water ; on stones 
and shells, and free on the sea-bottom. 
VARIETIE.S. 
a- Linearis. The condition above described, in which the root-band 
creeps in a narrow i-ibbon over stones and shells. Cornwall and Devon. 
(Plate X. fig. 5.) 
jS. Diffusus. The root-band spread over the surface of a shell as a 
continuous carpet, whence the polypes spring, irregularly crowded together. 
Northumberland. (Plate ix. fig. 10.) 
y. Liber. Unattached. The root-band forming a free cylinder, exactly 
resembling the column of the polype, and of the .same diameter. The 
polypes in this case branch irregularly from the cylinder, and terminate 
both its extremities. Shetland. (.Plate ix. fig. 9.) 
Tf wc selected a single specimen of each of these vaviclics, 
