SEA SLATER

I think that's what it is.

Moving hundreds of books back downstairs again, I came across my camera manual in a plastic bag, and this fell out. It was 3 cm long and dead, though I poked it with a long stick first to make sure. Poor thing; and thinking about where I have taken the manual recently, I've no idea whether the beastie is Scottish, Northumberlandish, or French.

I contemplated adding it to my Pocket Scavenger book, but on reflection it would have been a bit messy.