12 Rissoa membranacea.

12 Rissoa membranacea.

The snout has an unpigmented, yellowish-white ventral face and a longitudinal slit mouth (1) in the terminal cleft. The mantle varies in colour and often has opaque white spots (2) which may be difficult to see on whitish areas. Shell height 8.4 mm. Orkney, Scotland. May 2017. Leg. S. Taylor.

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