Radula - a horny band or ribbon in mollusks other than bivalves that bears minute chitinous teeth on its dorsal surface and scrapes or tears off food and draws it into the mouth, Periostracum - a chitinous layer covering the exterior of the shell in many mollusks, being usually well developed in freshwater forms, and serving to protect the shell from corrosion, Nacre - the hard pearly iridescent substance forming the inner layer of a mollusk shell, Open Circulatory System - It is primarily found in invertebrates, Veliger - a larval mollusk in the stage when it has developed the velum, Ctenidia - the gill of a mollusk consisting typically of a respiratory structure that resembles a comb or feather, has a main stem with lateral lamellae, and is developed from the inner side of the mantle, Dextral - having the whorls coiling clockwise down the spire when viewed with the apex toward the observer and having the aperture situated on the right of the axis when held with the spire uppermost and with the aperture opening toward the observer, Sinistral - having the whorls coiling counterclockwise down the spire when viewed with the apex toward the observer and having the aperture situated on the left of the axis when held with the spire uppermost and with the aperture opening toward the observer, Apex - the point of sharpest curvature in a path (such as that followed by a turning vehicle), Aperture - an opening or open space, the diameter of the stop in an optical system that determines the diameter of the bundle of rays traversing the instrument, Mucus - a viscid slippery secretion that is usually rich in mucins and is produced by mucous membranes which it moistens and protects, Base - the bottom of something considered as its support : FOUNDATION, Operculum - a body process or part that suggests a lid: such as,a horny or shelly plate on the posterior dorsal surface of the foot in many gastropod mollusks that closes the shell when the animal is retracted, Torsion - the twisting or wrenching of a body by the exertion of forces tending to turn one end or part about a longitudinal axis while the other is held fast or turned in the opposite direction, Proboscis - any of various elongated or extensible tubular processes (such as the sucking organ of a butterfly) of the oral region of an invertebrate, Umbo - the boss of a shield, Incurrent Siphon - The siphon which takes in water is called the incurrent, or inhalant siphon, and it lies on the ventral side (underside) of the clam. Water is expelled through the excurrent, or exhalent siphon, which is located dorsally (back side). Coloration of the siphons varies from cream to dark brown or black., Cuttlebone - the shell of a cuttlefish that is sometimes used for polishing powder or for supplying cage birds with lime and salts, Chromatophores - a pigment-bearing cell, Sepia - a brown melanin-containing pigment from the ink of cuttlefishes,

Zoology 3

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