Steromphala umbilicalis (da Costa, 1778).)
Unless eroded, shell always has broad red to reddish-purple bands radiating from apex across the whorls. Diameter to 22 mm.
Shell-profile not stepped.
Open circular umbilicus at all growth stages.
Snout short, yellowish or greenish with dense transverse dark purple lines; lacks bright blue papillae.
Middle levels of rocky shores from Kent along south and west coasts round onto north coast Scotland, with a few records on west coast of Orkney.