A pirate ship! It's amazing what you see when you're looking!
Grace, the images below are of octopus egg sacs. Karin told me. I'm so excited by this fact. I've collected more since I posted about the first one (when I still thought it was some kind of shell). Unfortunately, most are broken. But I'm delighted with the thought of all of those baby octopi that must be pulsing through the Golfo Dulce right now! :)
Not so much with the "hilos de oro" ("golden threads") jellyfish that stung us this morning!
HA! I never would have guessed.