Don't ask. Just don't ask. I have no idea where this guy is hanging from, but he is definitely lacking in the dignity department. Paul described the surface of Saturn as being swampy and unstable, so he drew the inhabitants as being like aubergines crossed with water spiders. It's actually a clever use of science trivia, since the density of Saturn is less than that of water. Paul suggested that this meant a squishy surface, but it is now believed that Saturn, like the other gas giants, has no actual surface, but is made of a mixture of hydrogen and helium that grows steadily denser as one reaches the core.
It does, however, make for some of the most exciting bungee jumping around.