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A genus of marine gastropod mollusks, having a conical or limpetlike shell, with an opening at the apex; -- called also keyhole limpet.

One of numerous species of marine gastropod shells, belonging to Ranella and allied genera.

Same as Gastropod.

Same as Gastropoda.

Same as Gastropodous.

A division of gastropods in which the odontophore is without teeth.

eback. The immature ones are called bluesides. -- Harp shell (Zoöl.), a beautiful marine gastropod shell of the genus Harpa, of several species, found in tropical seas. See Harpa.

An order of pelagic Gastropoda, having the foot developed into a median fin. Some of the species are naked; others, as Carinaria and Atlanta, have thin glassy shells.

An artificial division of gastropods, including those that have an entire aperture.

ative calomel, or bichloride of mercury. -- Horn shell (Zoöl.), any long, sharp, spiral, gastropod shell, of the genus Cerithium, and allied genera. -- Horn silver (Min.), cerargyrite. -- Horn slate, a gray, siliceous stone. -- To haul in one's horns, to withdraw some arrogant pretension. [Colloq.] -- To raise, or…

An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera. -- Hy`dro*bran"chi*ate, a.

Any gastropod of the genus Ianthina, of which various species are found living in mid ocean; -- called also purple shell, and violet snail. [Written also janthina.]

A suborder of marine gastropod mollusks, in which the gills are between the foot and the mantle.

Having no operculum; -- said of certain gastropod shells.

A subclass of Gastropoda, in which the body is symmetrical, the right and left sides being equal.

ch produces ivory nuts. -- Ivory shell (Zoöl.), any species of Eburna, a genus of marine gastropod shells, having a smooth surface, usually white with red or brown spots. -- Vegetable ivory, the meat of the ivory nut. See Ivory nut (above).

In a general sense, any hatshaped, or conical, gastropod shell.

A genus of spiral gastropod shells, often of large size, characteristic of the lower Silurian rocks.

The middle portion of the foot in the Gastropoda and Pteropoda.

The posterior division of the foot in the Gastropoda and Pteropoda.