Dissected female, mantle intact. Terms are defined in glossary  below.

1:  sole of foot. 2: dorsum of foot.

4: operculum. 5: mantle edge.

6: unblotched mantle.7: darkly blotched mantle.

8: respiratory inhalent siphon.

9: osphradium (under mantle).

10: ctenidium (under mantle).

11: hypobranchial gland,(under mantle)

12: kidney. 13: digestive gland.

14: stomach (two ends of). 15: ovary.

16: auricle of heart. 17: ventricle of heart.

Llŷn Penisula, Wales, March 2016.