Molluscs of the Northern Seas from Résultats des Campagnes Scientifiques by Albert I, Prince of Monaco… Free Image from public domain license 
Different types of seashells illustration from Zoology of New York (1842–1844) by James Ellsworth De Kay. Original from… Free Image from public domain license 
Oysters, Mussels and Moon Horn by anonymous (1560–1585). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 