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Testacea :: Testacea (n. pl.) Invertebrate animals covered with shells, especially mollusks; shellfish..

Physa :: Physa (n.) A genus of fresh-water Pulmonifera, having reversed spiral shells. See Pond snail, under Pond..

Mollusca :: Mollusca (n. pl.) 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 incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or m

Rhachiglossa :: Rhachiglossa (n. pl.) A division of marine gastropods having a retractile proboscis and three longitudinal rows of teeth on the radula. It includes many of the large ornamental shells, as the miters, murices, olives, purpuras, volutes, and whelks. See Illust. in Append..

Paucispiral :: Paucispiral (a.) Having few spirals, or whorls; as, a paucispiral operculum or shell..

Lyopomata :: Lyopomata (n. pl.) An order of brachiopods, in which the valves of shell are not articulated by a hinge. It includes the Lingula, Discina, and allied forms..

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..

Escalop :: Escalop (n.) A bivalve shell of the genus Pecten. See Scallop.

Cowry :: Cowry (n.) A marine shell of the genus Cypraea.

Fossil :: Fossil (a.) Like or pertaining to fossils; contained in rocks, whether petrified or not; as, fossil plants, shells..

Eye :: Eye (n.) The scar to which the adductor muscle is attached in oysters and other bivalve shells; also, the adductor muscle itself, esp. when used as food, as in the scallop..

Half-deck :: Half-deck (n.) A shell of the genus Crepidula; a boat shell. See Boat shell.

Harpa :: Harpa (n.) A genus of marine univalve shells; the harp shells; -- so called from the form of the shells, and their ornamental ribs..

Gryphaea :: Gryphaea (n.) A genus of cretaceous fossil shells allied to the oyster.

Turban :: Turban (n.) The whole set of whorls of a spiral shell.

Polythalamous :: Polythalamous (a.) Many-chambered; -- applied to shells of Foraminifera and cephalopods. See Illust. of Nautilus.

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

Alveolus :: Alveolus (n.) A small cavity in a coral, shell, or fossil.

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

Roughcast :: Roughcast (n.) A kind of plastering made of lime, with a mixture of shells or pebbles, used for covering buildings..

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