28 Steromphala cineraria profile variation. Aug. 2013. Menai Strait, Wales.

28 Steromphala cineraria profile variation. Aug. 2013. Menai Strait, Wales.

Top left: Low conoidal profile with breadth (8.1mm) much greater (180%) than height (4.5mm).
Bottom left: Breadth (12.5mm) 139% of height (9mm).
Right: Higher conoidal profile. Breadth (12.8mm) 116% of height (11mm).
Note that last two shells virtually same width, but steepness of profile variable.