Mantle extended over entire exterior of shell; stretched so translucent enough for pinkish shell to be discerned.
1: whitish inhalent siphon with yellow tip and opaque white marks.
2: spray of very fine grey particles on mantle.
3: fine grey particles aggregated into small blotches on adult.
5: unobtrusive, pale yellow border on mantle rim.
4: pitch-brown/black pigment blotches interrupting pale yellow border on mantle rim.
6: distinct, broad, peripheral chamfer on dorsal surface of foot.
7: whitish blotches, but not extensive well-defined lines, on dorsum of foot.

Height (longest shell-dimension) 8.5 mm. Menai Strait, Wales. March 2011.