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Cowry or cowrie, plural cowries, is the common name for a group of small to large sea snails, marine gastropod molluscs in the family Cypraeidae, the cowries. The word ''cowry'' is also often used to refer only to the shells of these snails, which overall are often shaped more or less like an egg, except that they are rather flat on the underside. Many people throughout history have found (and still find) the very rounded, shiny, porcelain-like shells of cowries pleasing to look at and to handle. Indeed the term "porcelain" derives from the old Italian term for the cowrie shell (''porcellana'') due to their similar translucent appearance.〔''Oxford English Dictionary'': "The ceramic material was apparently so named on account of the resemblance of its translucent surface to the nacreous shell of the mollusc. () The cowrie was probably originally so named on account of the resemblance of the fissure of its shell to a vulva (it is unclear whether the reference is spec. to the vulva of a sow)."〕 Shells of certain species have historically been used as currency in several parts of the world, as well as being used, in the past and present, very extensively in jewellery, and for other decorative and ceremonial purposes. Some species in the family Ovulidae are also often referred to as cowries. In the British Isles the local ''Trivia'' species (family Triviidae, species ''Trivia monacha'' and ''Trivia arctica'') are sometimes called cowries. The Ovulidae and the Triviidae are somewhat closely related to Cypraeidae. == Shell description == The shells of cowries are usually smooth and shiny and more or less egg-shaped, with a flat under surface which shows a long, narrow, slit-like opening (aperture), which is often toothed at the edges. The narrower end of the egg-shaped cowry shell is the anterior end. The spire of the shell is not visible in the adult shell of most species, but is visible in juveniles, which have a different shape from the adults. Nearly all cowries have a porcelain-like shine, with some exceptions such as Hawaii's granulated cowry, ''Nucleolaria granulata''. Many have colorful patterns. Lengths range from 5 mm for some species up to 19 cm for the Atlantic deer cowry, ''Macrocypraea cervus''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cowry」の詳細全文を読む スポンサード リンク
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