Large, sheltered shore form with tall spire (1), 50% of shell height. Small aperture 50% of shell height. Old specimen over 6 years old; shell bored and eroded by Polydora worms. Line of worm holes diagonally across body whorl, and protruding worm-palps visible (2).

Shell height 40.6 mm. Menai Strait, Wales. June 2013.