Two views of a 7.5 mm adult turned at different angles to show all features within palatal (outer) lip.
Single views of three juveniles, heights 5.8mm and 4.5mm.
1: sharp adapical angle of aperture.
2: parietal lip is a wide glazed area on the body whorl.
Juveniles (under 6.5mm high).
Protrusions in juv. aperture often same as in L. bidentata.
3: thin palatal (outer) lip lacks internal teeth and ridge.
4: columellar lip (lower part of inner lip) has two raised folds (partly concealed on some images as shell not tilted so as to show them).
5: parietal lip (upper part of inner lip) usually lacks a denticle.
Adults (over 6.5mm high).
6: palatal lip often has internal pale calcareous ridge close to its rim.
7: often a single raised white denticle within the ridge.
8: columellar lip (lower part of inner lip) has two raised folds.
9: parietal lip (upper part of inner lip) often has a denticle.
Concise summary
juvenile: 2 protrusions on inner lip. No ridge or denticle inside outer lip. (As in L. bidentata)
adult: 2, often 3, protrusions on inner lip. Often a ridge, with or without single denticle, within aperture on outer lip.
Salting on Severn Estuary, Gloucestershire, England. August 2011.