Profile change with growth.
Top left: Height 4.2mm.
Aperture 44% of height. Body whorl 76% of height. Low conoidal profile with breadth much greater (173%) than height
Bottom left: Height 8.9mm.
Aperture 36% of height. Body whorl 70% of height. Breadth 121% of height.
Centre: Height 11.4mm.
Aperture 44% of height. Body whorl 69% of height. Breadth 110% of height.
Right: Height 14.6mm
Aperture 38% of height. Body whorl 70% of height. High conoidal (like straw beehive) with breadth about equal (101%) to height.

About 7 raised, slightly nodose, spiral lines above periphery on body whorl continue, decreasing in number, onto whorls of spire.
Menai Strait, Wales. February 2014.