The shell is a swollen “bubble”, H. 31 mm, with many fine prosocline growth lines and close-set, wavy, microscopic, spiral striae (magnified in inset). The spire is wound round a central cavity (1) instead of a solid columella. This specimen has a spire which is almost flush with the body whorl (2) and an aperture almost as long (3) as the shell’s height. Live taken shell with glossy periostracum. Subsutural slit (4). The columellar lip (5) is whitish and slightly folded and protruded. Seawater pond, Oban, Scotland. April 2010. Leg. J.C.A. Craik.

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