03 Steromphala cineraria

03 Steromphala cineraria

Top: breadth 7.25mm. Sutures distinct on young shells.
Left: breadth 10.8mm.
Centre: breadth 12.5mm. Sutures distinct on young shells.
Right: breadth 14.8mm. Sutures not so distinct on fully grown shells. Blunt apex eroded exposing silver nacre layer.
Menai Strait, Wales. February 2014.