The ammonite on my windowsill

Our Liparoceras was a happy ammonite that swam in the tropical sea of early Jurassic Birmingham 200 million years ago. It bobbed along upright in its shell looking for prey - which was pretty much anything it could catch: fish, other cephalopods and so forth. In fact, it looked quite like a cuttlefish stuffed into a snail shell, with all ten tentacles sticking out. It swam by jet propulsion, squirting water through its siphon, and also squirted ink at any ichthyosaur that came too close.