Public domain
Selection of Rare Shells, Volume 5: Clams, Oysters, and Sea Urchins
From the collection of National Diet Library, Japan. Free to download, adapt and use — no permission needed.
Credit line介殻稀品撰 巻5 蛤蛎海膽. 〔武蔵石寿//著〕. National Diet Library, Japan. Public domain.