Post veliger juvenile.

Shell entirely translucent white; lacks operculum and periostracum. Overall shape ovoid.

1: spire, 3% of height, exposed adjacent to 2: top of body whorl.

3: body whorl 100% of height.

4: sculpture of ribs and grooves commenced formation on apertural face (ventral face when animal alive).

5: aperture 100% of shell height, gently-curved linear as on adult but wider.

6: outer (palatal) lip bent into aperture.

7: no columellar or parietal lip on body whorl on inner side of aperture.

9.6 mm high. Orkney 1975.