. Beautiful shells : their nature, structure, and uses familiarly explained; with directions for collecting, cleaning, and arranging them in the cabinet; descriptions of the most remarkable species, and of the creatures which inhabit them; and explanations of the meanings of their scientific names, and of the terms used in conchology. Shells; Mollusks. ^VRBINATEB. If we take a Common Snail, and plunge it into boiling water, which will instantly kill it, so that it can be re- moved from the shell, we shall find the whole of that part of the body which was lodged in the upper whorls, or spiral p
. Beautiful shells : their nature, structure, and uses familiarly explained; with directions for collecting, cleaning, and arranging them in the cabinet; descriptions of the most remarkable species, and of the creatures which inhabit them; and explanations of the meanings of their scientific names, and of the terms used in conchology. Shells; Mollusks. ^VRBINATEB. If we take a Common Snail, and plunge it into boiling water, which will instantly kill it, so that it can be re- moved from the shell, we shall find the whole of that part of the body which was lodged in the upper whorls, or spiral part of the shell, is covered with a thin membrane or skin; this is called the mantle, and that portion of it which cor- responds with what we may consider as the back of the mollusk, and which is considerably thickened, is termed the collar; here are situated the glands, which secrete the colouring and other matter of which the shell is mainly composed; although the substance called naere, or mother-of-pearl, is secreted in the thinner part of the mantle; it is however from the collar that the growth or increase of the shell proceeds. It is in accordance with certain variations in the shape and disposition of this mantle and collar, that shells assume such very different shajDes. Sometimes the whorls or spiral ridges, are 2)rojected or thrown far out, and this produces the turbinated shell. Sometimes they scarcely rise above each other, but rather spread towards the sides, and then we have the discoid shape. Generally speaking, the whorls of a shell take a direc- tion from left to right, but occasionally an opposite one;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Adams, H. G. (Henry Gardiner), 1811 or 12-1881. London : Groombridge and Sons
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Keywords: ., bookcentury1800, bookdeca, booksubjectmollusks, booksubjectshells
