Things You See On A Walk In Namibia

So I was out having my regular afternoon stroll on the desolate diamond-rich coast of Namibia's "Forbidden Zone" (as you do), and I came across this:




It was SEVEN FEET LONG. Yes. More than TWO METRES. And there were dozens of them washed up on the beach:



What the F? Does anyone know what species these jellyfish might be? Or are they just dead aliens or something?

Crazy. And brilliant. Namibia is wild.