Improved views of the sole of the foot and underside of the head can be obtained when small snails crawl on the undersurface of the water; sole of foot, black opercular lobes, and underside of head and tentacles are visible in this image.
Full article of Anatomy of marine gastropods without dissection. below image 2 2 Gastropod anatomy. Transparent sole of Janolus hyalinus on undersurface of water.