Short spire Thin shell-wall as usual on juveniles, (also on adults on stable rock on wave-exposed shores).
1: thin palatal lip white inside and greyish white outside, crenulated by spiral grooves. External dark spiral bands visible internally through thin edge of lip.
2: wide columellar lip white with no tint of another colour.
3: base of aperture has slight spout.
4: juvenile spiral bands slightly more angulated than on adults.
5: brown spiral lines confined to grooves between broad spiral bands.

Juvenile 6.8 mm high. Anglesey, March 2015.