Kosmoceras

Mertensia ovum - a ctenophore, also known as comb jelly.

From Claire Nouvian’s book, The Deep. Highly recommended. It’s a book that packs more than stunning photographs: the book details so much newly-gained knowledge of various deep-sea organisms, often photographed in situ. 

Note that the iridescence often observed on a ctenophore’s ciliary rows are not an example of bioluminescence. It’s simply a refraction of light.

montereybayaquarium:

We only exhibit spotted comb jellies (Leucothea pulchra) when they’re present in the bay—and we have them now in the Drifters Gallery. We’re the only aquarium to exhibit these fragile jellies, so have a look while they last!

Leucothea means “pale goddess” and pulchra “beautiful”, so it’s all appropriate.