This was my find of the day: Doto kya, which I've only seen once before. At least I think it's D. kya. The dark pigmentation doesn't seem to extend to the foot, it has white flecks on the rhinophores. They're supposed to eat Plumularia, though, and I don't think the hydroid I found this one was Plumularia. Symplectoscyphus, perhaps? It's certainly fun to say...