Ever since I first read about these fantastic animals in The Hong Kong Countryside by G. A. C. Herklots, which as anyone who follows my inky-fingered scribblings or indeed my video equivelants, will know has been one of the most important books in my life, I have wanted to see one. They turn up in the UK on occasion and one day I shall see and maybe even keep some.
What are they? Oh, didn't I say? As far as I know they are the world's only species of freshwater jellyfish.