10 shells of varied shapes and colors, numbered "Fig. 514" through "Fig. 523". Original from the Minneapolis Institute of… https://www.rawpixel.com/image/7652722/image-plant-vintage-artFree Image from public domain license23 shells, mostly of conical or bulbous shapes and varied colors; long red and white conical shell at center; numbered "Fig.… https://www.rawpixel.com/image/7652470/image-vintage-art-logoFree Image from public domain licensebrown mussel at right, rust-reddish mussel at left, numbered "Fig. 773" and "Fig. 774". Original from the Minneapolis… https://www.rawpixel.com/image/7652472/image-vintage-art-public-domainFree Image from public domain licenseHeinrich Wilhelm Matthias Olbers. Lithograph by R. Suhrlandt. https://www.rawpixel.com/image/13972359/heinrich-wilhelm-matthias-olbers-lithograph-suhrlandtFree Image from public domain licenseFranz Joseph Gall. Stipple engraving by F.W. Bollinger after C.H. Rahl. https://www.rawpixel.com/image/14008488/franz-joseph-gall-stipple-engraving-fw-bollinger-after-ch-rahlFree Image from public domain licenseSilhouetportret van Charles Guillaume Merkus (1833 - 1870) by Friedrich Heinrich Wilhelm Schröder and Pieter Barbiers IV https://www.rawpixel.com/image/13790015/image-paper-cartoon-faceFree Image from public domain licenseDietrich Wilhelm Heinrich Busch. Lithograph by F. Jentzen after F. Krüger. https://www.rawpixel.com/image/13971737/dietrich-wilhelm-heinrich-busch-lithograph-jentzen-after-krugerFree Image from public domain licenseFriedrich Heinrich Wilhelm Martini. Mezzotint by J. E. Haid, 1775, after J. M. Falbe, 1775. https://www.rawpixel.com/image/13989776/image-face-person-artFree Image from public domain license