Mantle cut and opened out to left and right.
1: part of inner face of of mantle which probably bears the hypobranchial gland.
2: anus
3: rectum
4: left kidney opening/ urogenital aperture.
5: right kidney opening/ urogenital aperture.
6: gonads (inactive; in September). Colour similar in both sexes,
except February- May when ovaries green and testes pink or
cream. www.marlin.ac.uk/species/detail/1324
7: digestive gland (mostly concealed by 6).
8: right kidney.
9: heart.
10: ctenidium (gill).
11: intestine.
12: radular sac.
13: skeleton of ctenidium.
14: head.
Photograph interpreted with Fretter and Graham (1994, in Crothers, 2001, .).
Menai Strait, Wales. September 2016.