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One of the classes of Mollusca, of great extent. It includes most of the marine spiral shells, and the land and fresh-water snails. They generally creep by means of a flat, muscular disk, or foot, on the ventral side of the body. The head usually bears one or two pairs of tentacles. See Mollusca. [Written also Gasterop…

Those Gastropoda that breathe by branchiæ, including the Prosobranchiata and Opisthobranchiata.

A group of Gastropoda, with limpetlike shells, including the abalone shells and keyhole limpets.

Same as Gastropoda.

One of the Gastropoda. [Written also gasteropod.]

Of or pertaining to the Gastropoda.

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.

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

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

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

One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, PteropodaScaphopoda, and Lamellibranchiata, or Conchifera. These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, which in…

sa, Tritia, and other allied genera of the family Nassidæ; a dog whelk. See Illust. under Gastropoda. -- nas"soid, a.

id closing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda.

A division of Gastropoda, including those that have a comblike gill upon the neck.

is, with the mouth at the end, as the cones, whelks, tritons, and cowries. See Illust. of Gastropoda, and of Winkle.

Same as Gastropoda.