Glaucus

[L., sea green.]
(Zoöl.) A genus of nudibranchiate mollusks, found in the warmer latitudes, swimming in the open sea. These mollusks are beautifully colored with blue and silvery white.

As a species name, means “having leaves or other parts with a white coating.” For example, the white spruce, Picea glauca, is not white, but its needles are lighter colored than those of other spruces because they are covered with a waxy white film.