Garden molluscs » Slug or snail? » Shell shape » Shell about as wide as tall » Does the shell have an umbilicus?
Shell about as high as wide. Is an umbilicus present?
Does the shell have an umbilicus? (The umbilicus is the cavity surrounding the axis, opening at the base of the shell.)
The adult shell of some species has the umbilicus completely sealed by the lip of the mouth – BEWARE: juveniles may still show signs of the umbilicus.
Click on the image below which has an umbilicus like your specimen.
Umbilicus is just a chink.
No umbilicus
Umbilicus present