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acephala actiniae animal anus aperture appears appendages Aristotle arms articulated attached bivalves Blainville body branchial branchial cavity Brug buccinum byssus calcareous canal cavity Chemn coasts colour columella composed conchology considerable corneous divided edge eggs elongated envelope external extremity fibres filaments fleshy fluid foot fossil furnished genera genus gills head hinge hole inhabit interior internal intestinal intestinal canal Lamarck laminae less ligament Linnaeus live locomotion lusca manner mantle margin mass matter Mediterranean medusae membrane mollusca mouth multivalves muscles muscular mussels observed octopi operculum organs orifice oval ovaries oviduct oysters patellae pedicle polypi posterior pretty nearly probable proboscis produced properly so called resembles respiration round sepia side skin sometimes sort species spiral spire stomach substance suckers summit surface teeth tentacula terminated testa thick tion transverse tubercles tubes univalve univalve shells valves viscera whorl worms zoophytes
Page 118 - Have the mantle open at the anterior extremity, or near the middle only, for the passage of the foot, and extended from the other end into a double tube, which projects from the shell, whose extremities are always gaping. Nearly all of them live buried in sand, stones, ooze, or wood. Those of the genus
Page 43 - There are four stomachs, the second of which is fleshy, and sometimes armed with bony appendages, and the third furnished internally with salient longitudinal laminae; the intestine is short. Various species inhabit both the Mediterranean and the Atlantic, some of which are large, and marked with the most beautiful
Page 31 - to as a proof that the muscles of the animal can be detached from the shell; for, at a particular epoch, of all the whorls of the spire originally possessed by this bulimus, not a single one remains.
Page 136 - attached to various bodies, the aperture of which is more or less closed by two or four valves. This tube is formed of various pieces which appear to be detached and separated, in proportion as the growth of the animal requires it. The
Page 87 - or little pyramids forming a cordon, more or less complete, under the borders of the mantle, very nearly as in the inferobranchiata, from which they are distinguished by the nature of their hermaphroditism; for,
Page 3 - They most generally have salivary glands, and always a large liver, but neither pancreas, nor mesentery ; several have secretions which are peculiar to them. They also present examples of all the modes of generation. Several of them possess the faculty of self-impregnation ; others, although hermaphrodites, have need of a reciprocal intercourse. Many have the sexes separated. Some are
Page 49 - by their foot, which, instead of forming a horizontal disk, is compressed into a vertical muscular lamina, which they use as a fin, and on the edge of which, in several species, is a dilatation forming a hollow cone, that represents the disk of the other orders. Their
Page 53 - or strips, laid parallel with each other, like the teeth of a comb, are attached on one, two, or three lines, according to the genus, to the ceiling of the pulmonary cavity, which occupies the last whorl of the shell, and which has a large opening between the edge of the mantle and the body. In two genera only, Cyclostoma and Helicina, do we find, instead of
Page 6 - and walking. They swim with the head backwards, and crawl in all directions with the head beneath and the body above. A fleshy funnel, placed at the opening of the sac, before the neck, affords a passage to the excretions. The cephalopoda have two