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Margarites argentatus : ウィキペディア英語版 | Margarites argentatus
''Margarites argentatus'' is a species of sea snail, a marine gastropod mollusk in the family Margaritidae. ''Margarites argentatus'' var. ''gigantea'' Leche, 1878 is accepted as ''Margarites giganteus'' (Leche, 1878) ==Description== The height of the shell attains 3.5 mm. The small, thin shell is narrowly umbilicate. The spire is globose-depressed, and conoidal. It is subtransparent, corneous or bluish white in color. The surface is lusterless and dull. It is closely marked all over by fine, close-set spiral striae, scarcely visible except under a lens. The blunt apex minute. The four whorls are tumid. The suture is deeply impressed. The circular aperture is oblique. The outer lip is simple and acute. The inner lip is arcuate, a trifle reflexed. The narrow umbilicus is deep.〔(Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia )〕
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