Photo 1: Shag-rug nudibranch on sandy bottom.
Shag-rug nudibranch: Aeolidia papillosa
Common names: sea mouse, grey sea slug, shaggy mouse nudibranch
This nudibranch has grey cerata (gills) covering its back, giving it its name. It feeds on anemones and, amazingly, stores the stinging cells in its cerata to ward of potential predators.