06 Nucella lapillus. Height 15mm. Menai Strait, Wales. February 2013.

06 Nucella lapillus. Height 15mm. Menai Strait, Wales. February 2013.

2½ years old (operculum has third winter-pause growth line in formation). Interior of aperture shows exterior colours and pattern of broad spiral bands through thin translucent shell; will start to thicken in current year. Adapical angle acute on young thin-shelled specimens.