Any of the marine gastropod mollusks of the genus Fasciolaria, especially Fasciolaria tulipa.

A cowrie.

Any species of Pleurotomaria, a genus of pearly spiral gastropod shells having a deep slit in the outer lip. Many fossil species are known, and a few living ones are found in deep water in tropical seas.

(zoology) A brachiopod (Brachiopoda).

Any of several species of conical gastropod shells in the family Trochidae and genus Astraea in family Turbinidae, the margin of the shells being toothed somewhat like the rowel of a spur.

A pad made or consisting of shells.

The casing of a pulley block.

(zoology) A univalve shell whose volutions run in the opposite direction to that of a standard screw thread. / (computing) An interactive command shell initiated from a remote computer.

Any of multiple bivalves, particularly a bean clam, but sometimes also a tellin or close relative.

A census-designated place in Contra Costa County, California, United States.