The royal natural history . ned from a white vein at the upper part of the neck of themollusc. When first extracted, it is of the colour and consistency of cream,but subsequently changes, on exposure to light, to the deep purple tint. Thecommon British Purpura lapillus affords similar dye. Its scarcity and theuse of cochineal, and other dyes, render it valueless as a commercial erinaceus, the only British species, is common on oyster-beds, to which itis destructive. All the forms yet referred to have a somewhat roundish or ovateoperculum, with the nucleus terminal or subterminal,
The royal natural history . ned from a white vein at the upper part of the neck of themollusc. When first extracted, it is of the colour and consistency of cream,but subsequently changes, on exposure to light, to the deep purple tint. Thecommon British Purpura lapillus affords similar dye. Its scarcity and theuse of cochineal, and other dyes, render it valueless as a commercial erinaceus, the only British species, is common on oyster-beds, to which itis destructive. All the forms yet referred to have a somewhat roundish or ovateoperculum, with the nucleus terminal or subterminal, whereas in those whichfollow (Purpurinai) it is lateral. All the members of the genus Purpura arefurnished with strong, heavy shells, suitable for protecting the inhabitants from therough usage of the sea upon the rocky shores they mostly inhabit. They range fromthe Arctic to the Antarctic regions, the handsomest species coming from tropicalseas. The fry of several species are pelagic, and swim at the surface of the animal of Murex. b, Gill; &, Osphradium,or olfactory organ ; p, Purple-gland, 38o MOLLUSCS.
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectzoology
