Mollusca. Elements of Conchology: Prepared for the Use of Schools and Colleges (Google eBook)

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Turner & Fisher, 1843 - Mollusks - 104 pages
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Page 98 - the shell is twisted in an opposite direction : such shells are called " perverse " or " sinistral." The aperture, or mouth is that part of the lower whorl or body, through which the animal protrudes itself. This is one of the principal means of distinguishing the genera of univalve shells, and it varies much in its form
Page 99 - Spire consists of all the whorls of the shell except the lower one, which, as before observed, is termed the body of the shell. This spire is a prominent feature of the univalve; and upon its being elevated, depressed, &c., depends much of the generic and specific definition
Page 99 - or pillar, is that process which runs through the centre of the shell in the inside, from the base to the apex, and around which the whorls or wreaths of the spire are wound, (Fig.
Page 100 - shells, are those which have the umbilicus covered, in a greater or less degree, by a thin process ; which, in some, almost entirely closes the aperture or mouth. This character is most commonly to be met with among species of Buccinum and Murex.
Page 100 - white laminae or ridges, running spirally backwards, in a direction parallel to each other; those on the exterior lip may, in most instances, be traced through the outside of the shell, and are nearly alike in length, (Figs. 24, 25, and 42.)
Page 99 - Pillar lip, is a continuation of the glossy process with which the aperture is lined, and expanded on the columella, (Figs. 58 and 66.) It is also called the inner or internal lip,
Page 97 - The venter or belly, is the most prominent part of the lower whorl or body, generally situated in the vicinity of the lip over the aperture, and formed by the convexity of the aperture. In general this term is only made use of in describing shells, whose body is large in proportion to the size of the spire,
Page 81 - they are got out of the oyster, which, according to all accounts, is a. tedious, and rather disgusting operation. The oysters are put into pens, and there left until the animal matter becomes softened by putrefaction, when it is subjected to frequent washings, and the

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