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

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

Shell H. 3.1 mm. 1: edge (dots) of almost invisible, transparent, thin operculum. 2: thin, flat, white, opercular disc visible through operculum. 3: tip of flat, tentacular, opercular lobe extending horizontally beyond operculum.

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