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Rhomboid opening so not Chthamalus? - and try saying that with your mouth full of crackers.
Jamie from Briantspuddle
I went with Semibalanus as I thought I could see one pair of central plates bigger than the other pair. (ps: I can't even say it without crackers)
Lat/Lng: 57.3137, -6.1187
OS grid ref: NG520322