THE DEYONSIIIRE CUP-CORAL. 
311 
are wanting in some of the systems. They are broad, granular on 
both surfaces, with the upper edge very salient and rounded in outline. 
Those of the thii-d and fourth cycles subequal between themselves, and 
much smaller than the first and second, which also are mutually subequal. 
Columella. From twelve to twenty thin plates much twisted, with 
sinuous edges ; the summits much lower than the palules. 
Palules. Well-developed, more flexuous than the septa, of which they 
correspond to the third cycle. 
Colour. In general pure white, but in some specimens tinged with 
a lovely permanent rose-tint. 
ANIMAL. 
Form. 
Column. Cylindrical, very extensile, smooth, membranous, invected 
towards the summit, each invection becoming a tentacle, without any 
distinct margin. 
Disk. Flat, but readily assuming a conical form. No trace of gonidial 
radii, tubercles, or groove. 
Tentacles. About fifty in number, arranged in three subequal rows : 
stem conical, membranous, translucent, studded with transverse oblong 
warts ; head globose, opaque, covered with palpocils. (Plate xii. fig. 4.) 
Mouth. A lengthened ellipse or a slit. Lip coarsely furrowed, like the 
lips of a cowry-shell. Stomach flat when empty, as in Anemones. 
All the tissues can be enormously distended with water. 
Colour. 
Column. A very faint bay or fawn colour, with longitudin.al lines of 
chestnut. 
Disk. Transparent white, with a broad Vandyked circle of rich 
chestnut surrounding the mouth. 
Tentacles. Stem-wall colourless, with the warts deep chestnut ; head 
opaque, pearl-white, sometimes slightly tinged with rose. 
Mouth. Pure white. 
Size. 
Corallum. Fine specimens attain a diameter of three-fourths of an inch, 
and a height nearly as great. 
Animal. Tire column when distended frequently stands an inch above 
the corallum, and exceeds it in breadth by a sixth of an incli on every 
side; the tentacles augment the height still further by nearly half an inch. 
Locality. 
On various parts of our coast in deep water, attached to stones and 
shells : Devon and Cornwall, on rocks between tide-marks. 
