1: sheath rim dilated (can contract).
2: yellowish white, internal digestive gland visible in slender, translucent, whitish ceras.
3: subepidermal, brown pigment in the mesial face of a ceras.
4: crowded white granules fill the elongate tubercles.
5: brown granule at apex of tubercle not neatly spherical.
6 irregular dark brown marks and streaks on the surface additional to the one in the apex of each tubercle.
7: brown pigment on the dorsal surface of the foot.
Menai Strait, Wales. February 2014.