Under a stone on the lower shore in a pool.
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Over four years old, 140 reads and no comment.
One of Andy's legacy posts. Surely he would have been absolutely certain it was a Pleurobranch and nearly certain of a light-coloured one like this being Berthella and possibly thinking it might be Berthella plumula - fairly widely recorded in Cornwall
His photo is so like the white one here http://www.conchsoc.org/speciesGallery/517
But we will never know, as the photos are not quite good enough - are they?
Lat/Lng: 50.5445, -4.9813
OS grid ref: SW888758