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.

Submitted by Ian Smith on Sat, 12/03/2011 18:04
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I.F. Smith

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 All  26th April 1975, except 12mm adult; 7th Sept 1975.