1: translucent mantle.
2: thickened mantle edge.
5: ctenidium extracted with filaments spread.
6: hypobranchial gland containing greenish hypobranchial mucus.
7: rectum.
8: black rectal gland.
9: heart.
10: kidney.
11: visceral lump containing digestive gland and, in breeding season, ovary.
15: columellar muscle.
From shell height 28 mm. Llŷn Peninsula, Wales, March 2016.
: flic.kr/p/2op3qCC
Sets of OTHER SPECIES:
/