Things with Tentacles #3: Nautilus

For this swap you will make one Nautilus (or ammonite) theme ATC for your one partner. I'm including ammonites in with the nautilus swap because they're fairly similar, although ammonites are now extinct and nautiluses are still around. I do request that you use a live one for this swap and not just a fossil or a shell, because it's not much of a 'tentacles' swap if you don't see any tentacles!
All media are welcome but spend time on your card and make something original and uniquely yours that you would be proud to receive.

Past swaps in the series were: Octopus and Squid.
Future swaps in the series will be, in no particular order: cuttlefish, jellyfish, Cthulhu, and (possibly) Hentai. Anything other ideas for things I should include?

At the end of the series I might do a catch-up swap for people who want a whole set.