A history of the British sea-anemones and corals . of them inhabit tubes, which may be membranousand free, as in Cerianthus; membranous and investingepidermically, as in Edv;ardsia ; or mere burrows in thesand or mud, as in Halcampa, Peachia, and of them have the habit of distending the hinder partof the column with water, assuming the form of a blownbladder. A remarkably vigorous and spasmodic contractility inthis family indicates a more intense muscular force, andpoints to a higher physiological rank, than the precedingfamilies possess. Q 2 228 ANALYSIS OF THE GENERA. Tentacle
A history of the British sea-anemones and corals . of them inhabit tubes, which may be membranousand free, as in Cerianthus; membranous and investingepidermically, as in Edv;ardsia ; or mere burrows in thesand or mud, as in Halcampa, Peachia, and of them have the habit of distending the hinder partof the column with water, assuming the form of a blownbladder. A remarkably vigorous and spasmodic contractility inthis family indicates a more intense muscular force, andpoints to a higher physiological rank, than the precedingfamilies possess. Q 2 228 ANALYSIS OF THE GENERA. Tentacles of one kind, thick, pear-shaped. Mouth with a papillate gonidial tube Peachia. Mouth simple Ilyanthus. Column slender, long, worm-shaped. Invested with an epidermis Edwardsia. Without an epidermis ITalcam/pa. Tentacles of two kinds, marginal and gular. Naked; freely swimming Arachnactis. Dwelling in a membranous tube ; sedentary. Column inferiorly perforate Cerianthus. Column interiorly imperforate (Not British) . 229 GENUS I. ILYANTIIUS (Forbes). Column pear-shaped, tapering to a blunt point atthe inferior extremity, which is probably perforated.*Surface smooth, without suckers, warts, or loopholes. Tentacles of one kind only, marginal, numerous(i. e. exceeding thirty). Mouth of the ordinary form, with no prominentgonidial development. * There is no evidence on this point with respect to our two Britishspecies. Dr. Kelaart, in his Description of Ceylon Zoophytes, speakingof a species, which he has done me the honour to name Peachia Gossei, butwhich is evidently an Ilyanthus, says that it has an inferior orifice, largeenough to admit a moderate sized probe, which gives passage to ova andexcremeutitious matter. (Trans. Roy. Asiatic Soc. ; Ceylon Branch.) AXALYSI3 OF BRITISH SPECIES. Tentacles slender, filiform, long; lined Scoticus. Tentacles thick, conical, short; banded Mitchellii. ASTRJEACEA. ILYANTHIDJS. THE SCOTTISH PEARLET. Ilyanthus Scoticus
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