I'm told that this is a species of orange alcyonarian coral (thanks, Paul!). It was clinging to the top of an overhang on a night dive, and the negative is about 2:1. I've seen many things that are similar, in that they have orange central masses with white polyps, but the polyps are much thinner and whispier than on this one.

If you look carefully at about 2:00 on the orange mass, you can see the eyes of a tiny, transparent shrimp.

Nikon F4, 105mm f/2.8 AF Micro-Nikkor, Aquatica Housing, 2 Ikelite AI/n strobes, f/22, Kodak Ektar 100.

 
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