cowrie or cowry (both: kou´rē), common name applied to marine gastropods belonging to the family Cypraeidae, a well-developed family of marine snails found in the tropics. Cowries are abundant in the Indian Ocean, particularly in the East Indies and the Maldive Islands. Species of cowries inhabit the waters around S California and the warm waters southward from the SE United States. They characteristically have massive, smooth, shiny shells with striking patterns and colors. The upper surface is round and the lower flat. When alive, the cowrie's shell is usually concealed by its large mantle; as the cowrie creeps along the ocean bottom, the mantle envelops the shell. As the body grows, the inner whorls of the shell are dissolved, and the dissolved lime is then used to enlarge the outer whorl of the shell. Some shells have been used for money, e.g., those of the money cowrie, Cypraea moneta. The shells of various species are used also for personal adornment and in some primitive cultures indicate the rank of the wearer. The smooth brown cowrie, Cypraea spadicea, inhabits the protected outer coast and mud flats in S California, often as far north as Newport, Calif. The most prized cowrie for a shell collector is the tiger cowrie, Cypraea tigris, which grows to 4 in. (10 cm) in length and whose shell is considered by some to be the most lustrous shell of the South Pacific. Having the appearance of a tiger skin, it is white with many brown spots. Cowries are classified in the phylum Mollusca, class Gastropoda, order Mesogastropoda, family Cypraeidae.