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The crenulations on the margin, a feature of the species, are clear in this photo.
Yes, a kind of washboard/ rasping sound can be made by running your fingernail along them.
Origin 31st Jan
Nice photo (I've just come to it!) can you add the Tag ProjectM1 please.
Lat/Lng: 55.062, -6.0562
OS grid ref: NW410816