Lip, the outer edge of the aperture of univalves.
Littoral, of or belonging to the shore.
Lobated, rounded at the edges.
Longitudinal, the length of the shell from the apex to the base.
Lubricity, slipperiness, smoothness of surface.
Lunated, formed like a half moon.
Lunulated, crescent-shaped.
Lunule, a crescent-like mark or spot, situated near the anterior and posterior slopes in bivalve shells.
Luniform, in the shape of a crescent.