236 
ILYA NTH ID Ja. 
of them are bifid ; the back lobes have a temlency to be simple, except the 
central back one, which is large, and composed of two bifid ones united 
on a single stem ; this compound one is generally bent over as a protection 
to the orifice of the gonidial tube. The papillae resemble tentacles in that 
they are hollow, with thick walls, the internal surface of which is lined 
with brown pigment, deepening at the tips ; they are very moveable. 
Colour. 
Column. Pale red or flesh-colour, through which the edges of the 
septa appear as twelve white lines : the fore half of the column is fre- 
quently marked with irregular splashes of chocolate-brown, which are 
sometimes confluent. 
Disk. Pale red or bufif, each radius marked with two Vs of deep 
brown, one within the other, the points of which are outwards ; the point 
of the outer one meets the tentacle, and sends off a branch on each side, 
encompassing its foot. 
Tentacles. Pellucid, each marked on its front face with arrow-heads of 
deep brown, arranged in two longitudinal rows, the points downwards ; 
there are about six in each row, but near the tip they become indistinct. 
Each arrow-head is separated from its successor by one of opaque cream 
colour or pale sulphur-yellow. 
Mouth. White, with the farrows deep brown. 
Conchida. Pale salmon-colour; the lobes pellucid, with an opaque 
white core, which is crossed by a brown bar neai' the tip. 
SiZK, 
About four inches in length, and one in greatest diameter. I have seen 
the body lengthened to eight inches, without any signal attenuation. 
Locality. 
Torbay, at extreme low water, and thence downward, buried in sand. 
In a paper read before the Linnean Soeiety on the 20tli 
of ]\[arch, 1855, I charaeterised this genus and species 
from specimens presented to me by the Eev. Charles 
Kingsley. I named it after Mr. Charles W. Peach, who 
Avas the discoverer of the first British Ilyanthidan known, 
Avhich I at that time referred to the same genus. In June, 
1856, ]MM. Danielssen and Koren founded, on a speeies 
oceurring on the coast of NorAvay, their genus Siphon- 
actinia, Avhich is evidently identical Avlth this, though 
they appear to have mistaken the conchula for the mouth. 
