Identificaciones de pileated

I think this was the first time I saw a black/burn colored slug around here so I had to take a picture of it to figure out what it was.

Arion rufus? Arion vulgaris?

Whatever had happened to this piece of dirt was of equal interest to numerous small flies (and so it seems was the surface of the slug)

Source: DSC06894x, 90x

Road's End State Recreation Area and beach south from there.