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Cypraea vitellus (白星寶螺)

1. Habitat spans from the lower intertidal zone to the sub-tidal zone. 2. The surface of this shell carries a mark indicating itself to be a Horikawa specimen taken from Keelung. 3. Before the currency was standardized in the Qing dynasty, shells were used as money, with Cypraea being the most common. 

Digital Archives Project of Mesogastropoda mollusks, National Taiwan Museum