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Acephala acephalous mollusks admirable animal anus aperture apex apparatus Aspergillum beak beneath bivalve shell body branches branchiae branchial cavity Buccinum byssus calcareous Calmaries canal cephalopods characterised characters Class of Mollusca colour columella composed Conchology conical cuttle-fish differ distinguished divided edge elongated Explanation of Fig external extremity fleshy folded foot France furnished ganglia ganglion genera genus Greek heart hinge hole horny inferior inhabit lamina Latin ligament liver lodged lusks mantle membranous Mollusca mollusks mouth Murex muscle nacre Natural History nautilus nerves nervous system notch oesophagus opening operculum Order of Gasteropoda organs oval oysters pair of ganglia Patellae pearls pectinibranch placed planorbis plate posterior Poulpe properly so called pulmonea resemble respiration respiratory cavity right side Ruschenberger sack schools situate snails sometimes species spiral spire structure summit syphon tentacles tentacula thick tooth transverse tribe trochus tube tunicata Turbo umbilicus univalve valve viscera whorls
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