05 Lacuna crassior. Shell height 3.1 mm. Menai Strait. August 2013.

05 Lacuna crassior. Shell height 3.1 mm. Menai Strait. August  2013.

Shell H. 3.1 mm. 1: costal ridges of translucent periostracum. 2: pinkish-white body whorl. 3: orange viscera seen through translucent spire. 4: flat, tentacular, opercular lobe protruding vertically beyond operculum.

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