I was poking around in some “tide pools” in Florida (or what passes for tide pools in Boca Raton, anyway) and there were a bunch of interesting… sea snails? Some sort of shellfish. They were olive green, but with bright orange spikes, about an inch or two long. I can’t find anything like them on the “shellfish of Florida”-type sites.
I know it’s not a lot to go on, but does anyone have an idea where to start?