FMIB 47853 Valve of Unio in its Natural State, and the same with 'blanks' cut out from it Blanks as cut; three upper figures showing inside

Description:

Valve of Unio in its Natural State, and the same with 'blanks' cut out from it. Blanks as cut; three upper figures showing inside, three lower showing outside with or or less of the epidermis. The same ground but not 'centered' or polished. The same centered. i.e. with the central depression made, but not the holes. The same with the holes drilled complete. A dozen buttons, as fastened on card for sale Subject: Buttons, Pearl button industry, Unio, Freshwater mussels Tag: Shellfish