Wooden coffin-fittings with terracotta Medusa heads were common in early Ptolemaic Period cemeteries and were found in large numbers in Naukratis1. They served as protective devices

Medusa head coffin-fitting - Terracotta coffin-fitting

Terracotta coffin-fitting
W 7.0, H 6.0, T 2.0
Early Ptolemaic Period
© The Trustees of the British
Museum #CG33120

Medusa head coffin-fitting - Terracotta coffin-fitting

Terracotta coffin-fitting
W 6.5, H 6.5, T 1.7
Early Ptolemaic Period
© Birmingham Museums Trust
British Museum #1888A200.2

Reference

1See the descriptions of the British Museum