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Nice one Chris.
The shape of dogwhelks can be used to judge the degree of exposure to wave action see
Oh yes Chris, I've only just found this.
Nice, different, unusual, unlikely, un-most things. But Dog whelks sure enough.
(did you REALLY post this at 02.36?)
Lat/Lng: 51.5512, -4.1503
OS grid ref: SS510857