Lucinidae: Bivalvia or Bivalves. Two Shell Mollusks. Examples are: Linga, Anodontia and codakia. "Buttercup Shells" are a common name for Anodontia or the Tiger lucine for Codakia.
Lucinidae

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Lucina nassula(2) 11.44mm & 10.81mm-Marco Island-Lot#16413
Two F++/NG Lucina nassula(2) 11.44mm & 10.81mm.Conrad, 1846 Collected at low tide on mud, sand and eel grass flats in 1979 Marco Island, Florida....
$5.00 Sale: $3.75

Max: 1

Phacoides pectinatus(2) 2” or 49.92mm & 42.96mm. Jupiter #17394
Two F+/Near-Gem Phacoides pectinatus(2) 2” or 49.92mm &1 ¾” or #6797 42.96mm. Gmelin, 1791 Live collected on a sand bar at low...
$7.00 Sale: $5.25

Max: 1