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It was originally posted at these websites as Halgerda sp. A Genus: Bergh, 1880.
For some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I have chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.
More information on Halgerda willeyi are on Bill Rudman's Sea-Slug Forum!