This is a mussel shell from the family of Mytilidae which is composed of small to large marine and brackish-water bivalve molluscs. Species in the family Mytilidae are found in seas throughout the world, however, they are generally more abundant in colder waters.
More info here: https://en.wikipedia.org/wiki/Mytilidae
Accession #: 107.20
Captured with Artec Spider 3D Scanner
https://www.artec3d.com/portable-3d-scanners/artec-spider-v2