Ground colours of largest shell greenish yellow to brown.

Top left: Height 10.1mm, 79% of 12.8mm breadth.
Top middle: Height 13mm, 96% of 13.5mm breadth.
Bottom left: Height 15.1mm, 97% of 15.5mm breadth.
Bottom mid.: Height 16.2mm, 92% of 17.7mm breadth.
Right: Height 27mm, 102% of 26.5mm breadth.

Top left: Body whorl 87% of height.
Top middle: Body whorl 79% of height.
Bottom left: Body whorl 75% of height.
Bottom mid.: Body whorl 80% of height.
Right: Body whorl 80% of height.

Top left: Aperture 78% of height.
Top middle: Aperture 59% of height.
Bottom left: Aperture 50% of height.
Bottom mid.: Aperture 57% of height.
Right: Aperture 54% of height.
West Anglesey, Wales. March 2014 & (largest) Weymouth, April 2012.