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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).

and the like. It is an insoluble substance, and, unlike elastin, is not dissolved even by gastric or pancreatic juice. By decomposition with sulphuric acid it yields leucin and tyrosin, as does albumin. Called also epidermose.

d moths, which have stout, hairy caterpillars, flat beneath. Two common American species (Gastropacha Americana, and Tolype velleda) feed upon the apple tree.

ective tissue, or a membranous fold, which supports or retains an organ in place; as, the gastrophrenic ligament, connecting the diaphragm and stomach.

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.

A large British fluke, or flounder (Rhombus megastoma); -- called also carter, and whiff. marchpane.

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

An intermediate product formed in the gastric digestion of albuminous matter.

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…

A genus of marine gastropods, having rough, and frequently spinose, shells, which are often highly colored inside; the rock shells. They abound in tropical seas.

the five lines of the musical staff. -- Music shell (Zoöl.), a handsomely colored marine gastropod shell (Voluta musica) found in the East Indies; -- so called because the color markings often resemble printed music. Sometimes applied to other shells similarly marked. -- To face the music, to meet any disagreeable ne…

Any species of marine gastropods, of the genera Nassa, Tritia, and other allied genera of the family Nassidæ; a dog whelk. See Illust. under Gastropoda. -- nas"soid, a.

Any one of numerous species of marine gastropods belonging to Natica, Lunatia, Neverita, and other allied genera (family Naticidæ.) They burrow beneath the sand, or mud, and drill other shells.

A division of vermiform gastropod mollusks, without a shell, belonging to the Isopleura.

A genus of marine gastropods, mostly natives of warm climates.

of, pertaining to, or baring, eggs or egg capsules; as, the nidament capsules of certain gastropods; nidamental glands. See Illust. of Dibranchiata.