Delicate shell up to about 4mm high. It has up to 3 whorls with the last whorl occupying about 90% of the height of th shell - the spire is very low. The aperure is relatively large. The shell possesses an umbilicalis and relatively broad grove running into this. The shell is brownish in colour with a slight periostracum.
- Relatively low spire
- Lacuna vincta has a more pronounced spire
Found on lower shore on Fucus serratus and Fucus vesiculosus and some red algae. The spawn is a hemispherical clear mass of jelly containing about ten eggs which hatch as juvenile snails. The species is annual dying after spawning.
Occurs from th Barents Sea south to Iberia.