So is diopatra done?
Eunice is looking good. Should we give it Improved Initiative (B)?
Good suggestion on treasure for diopatra. I'll add it.
I'd like to stick with the Huge, 8 HD Eunice, since they're modeled off the more specific Bobbit worm (of which 4-foot or longer real-world specimens have been found). Sure, other members of eunicidae are smaller, but this one seems to make the best D&D encounter.