34 Steromphala umbilicalis album. COMPARISON image Steromphala tumida.

34 Steromphala umbilicalis album. COMPARISON image Steromphala tumida.

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Small; maximum width 10mm. Distinct stepped profile and flat body whorl. Narrow umbilicus that closes with age. Brownish bands and/or spots. All around Britain, usually sublittoral. Rarely live on shore, but dead shells sometimes on strandline. Iceland to Spain.