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Pteroceras :: Pteroceras (n.) A genus of large marine gastropods having the outer border of the lip divided into lobes; -- called also scorpion shell.

Peristome :: Peristome (n.) The lip, or edge of the aperture, of a spiral shell..

Echinus :: Echinus (n.) A name sometimes given to the egg and anchor or egg and dart molding, because that ornament is often identified with Roman Doric capital. The name probably alludes to the shape of the shell of the sea urchin..

Siphon :: Siphon (n.) The siphuncle of a cephalopod shell.

Nudibranchiata :: Nudibranchiata (n. pl.) A division of opisthobranchiate mollusks, having no shell except while very young. The gills are naked and situated upon the back or sides. See Ceratobranchia..

Chiton :: Chiton (n.) One of a group of gastropod mollusks, with a shell composed of eight movable dorsal plates. See Polyplacophora..

Cockle :: Cockle (n.) A bivalve mollusk, with radiating ribs, of the genus Cardium, especially C. edule, used in Europe for food; -- sometimes applied to similar shells of other genera..

Splintery :: Splinterproof (a.) Proof against the splinters, or fragments, of bursting shells..

Wampum :: Wampum (n.) Beads made of shells, used by the North American Indians as money, and also wrought into belts, etc., as an ornament..

Calcific :: Calcific (a.) Calciferous. Specifically: (Zool.) of or pertaining to the portion of the oviduct which forms the eggshell in birds and reptiles.

Potamian :: Potamian (n.) A river tortoise; one of a group of tortoises (Potamites, or Trionychoidea) having a soft shell, webbed feet, and a sharp beak. See Trionyx..

Conchiferous :: Conchiferous (a.) Producing or having shells.

Sheal :: Sheal (n.) A shell or pod.

Paries :: Paries (n.) The triangular middle part of each segment of the shell of a barnacle.

Goroon Shell :: Goroon shell () A large, handsome, marine, univalve shell (Triton femorale)..

Orbulina :: Orbulina (n.) A genus of minute living Foraminifera having a globular shell.

Aptychus :: Aptychus (n.) A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula..

Siphonobranchiata :: Siphonobranchiata (n. pl.) A tribe of gastropods having the mantle border, on one or both sides, prolonged in the form of a spout through which water enters the gill cavity. The shell itself is not always siphonostomatous in this group..

Columella :: Columella (n.) The upright pillar in the axis of most univalve shells.

Terebra :: Terebra (n.) A genus of marine gastropods having a long, tapering spire. They belong to the Toxoglossa. Called also auger shell..

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