A history of British star-fishes, and other animals of the class Echinodermata . ichopen and shut at the will of the animal; operculum lateral,slightly convex, deeply grooved, the grooves branched;margin obtuse, thick, protected by a double series of largesquare plates, studded with from two to four papillae, andeach of them surrounded with a series of granules; the KNOTTY CUSHION-STAK. 129 ventral surface is divided into four triangular spaces by thetentacular avenues, which are fringed on each side witha double series of smooth, blunt, short, and slightly com-pressed processes or spines; the
A history of British star-fishes, and other animals of the class Echinodermata . ichopen and shut at the will of the animal; operculum lateral,slightly convex, deeply grooved, the grooves branched;margin obtuse, thick, protected by a double series of largesquare plates, studded with from two to four papillae, andeach of them surrounded with a series of granules; the KNOTTY CUSHION-STAK. 129 ventral surface is divided into four triangular spaces by thetentacular avenues, which are fringed on each side witha double series of smooth, blunt, short, and slightly com-pressed processes or spines; the triangular spaces are veryrough with enlarged granules and valvular openings ; butthere are no dilated bases for papillae, and the valvularapertures are arranged in rows; in the centre of each ofthe compartments there is a large irregular fresh, the colour is a bright red or scarlet, but onkeeping, the colour fades to a faint and dirty Mr. Couch records the occurrence of one specimen of thisvariety on the coast of Cornwall, in his Cornish ipl^ K 130 ASTERIADJE. ASTERIJE.
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Keywords: ., bo, bookcentury1800, bookdecade1840, bookidhistoryofbritish00forb
