6.5mm juv., 10mm juv., 12mm juv., 10.2mm adult, 12 mm adult. LWS, Scapa Flow, Orkney. As shell grows, body whorl extends towards the spire eventually overwhelming it, while the aperture becomes a slit. Last juv. stage can be larger than early adult.
Species
Photographer / copyright holder
I.F. Smith
All 26th April 1975, except 12mm adult; 7th Sept 1975.
Late juvenile. Height 12 mm. At this stage, spire almost enveloped by final whorl, signs of adult shell ridges developing, shell shape approaching that of the adult, but still the juvenile white. Late juvenile shells are often larger than early adults.
Species
Photographer / copyright holder
I.F. Smith
LWS, Scapa Flow, Orkney April 1975
