Lacuna vincta has a well developed spire about 50% of shell height. On apertural-view, aperture occupies less than 50% of area. Columellar groove leads to umbilicus. Body whorl has four brown spiral bands which may merge. Body whitish with some grey; may also have yellow, orange or aquamarine parts.
Left: Height 10.1 mm, Orkney, March 1973.
Right: Shell height 5.3 mm. Menai Strait. August 2013.

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