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Found some in Langland Bay last year (ispot observation).
....is always good with these molluscs. I suggest a turn over pic if you've got one as the umbilicus is a dead give away (the hole right next to the aperture) for the ID of this sp.
thanks, next time i'll get more angles!
Lat/Lng: 51.5668, -3.98
OS grid ref: SS628871