Spirula

You won't be able to see the squid, it's really tiny and is living very deep in the ocean, but I am sure you'll find more shells :)

I found two, in my spotting too...But that's because these squids are abundant, and depending on the sea currents, they reach beaches in large numbers, although only a couple each time, is been spotted...But if you go to Canary islands, you 'll find more than just two in a whole beach :)

And @Martinl too :)

agree with despina sugestian a shell of spirula

It's spirula shell http://www.projectnoah.org/spottings/14664116

Very cool Martin! Nice spotting Muckpuk!

This is from a rams horn squid. It is a chambered shell and used as a buoyancy device, as in the chambered nautilus. http://www.teara.govt.nz/en/octopus-and-squid/5/2/1 http://www.blogthebeach.com/2009/nature/shells/rams-horn-squid-spirula-leaves-treasure-for-beachcombers

Very delicate lookinhg