Posterior of 32mm long specimen. LWS. Isle of Lewis, Scotland. April 2018. Leg. D.W. McKay & S. Taylor.
1: mantle cavity.
2: ctenidium.
3: mantle lappet.
4: mantle fold.
5: anal papilla with anus at tip.
6: dorso-ventrally flattened pericardium containing the heart.
7: channel through girdle to the exterior. Exit route for exhalent water with sperm or ova from gonopores among posterior ctenidia, excreta from lateral nephridiopores among posterior ctenidia, and faecal pellets from anus.

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