I've got them now. What a thoughtful gift!
Barnacles are my favourite filter-feeding arthropods, so I am delighted. The shell has pride of place on my mantelpiece.
She has now borrowed the trumpet whistle and drum and is playing all of them as a sort of one-octopus-band while the Fluffies dance around her! It may be some sort of Marine BlackMagic but at least they'll sleep tonight.
I was shocked that there was no Bake-off thread too.