Megastomia conoidea
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Megastomia conoidea is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.
Lip (gastropod)
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In the shell of gastropod mollusks, the lip is the free margin of the peristome or aperture of the gastropod shell.
A shell of Helix pomatia with part of shell removed; the outer lip and the inner lip are clearly visible
Inflected lip of Neobernaya spadicea
Foliated (fringed with spines) lip of Murex pecten
Slit lip of Mikadotrochus hirasei