01 Lacuna crassior. Shell height 5.5 mm. Orkney August, 1976.

01 Lacuna crassior. Shell height 5.5 mm. Orkney August, 1976.

Long stored shell with dried periostracum. 1: shell H. 5.5 mm. 2: body whorl 80% H. 3: aperture 53% H. 4: aperture occupies about 38% of area of view. 5: pinkish-white shell exposed. 6: deep sutures. 7: stepped profile.

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