The body is white, sometimes with a faint yellowish or pinkish hue (Jeffreys, 1867), varying in translucency in its different parts, with a very fine, opaque white stipple most noticeable where translucency is strongest; in these images the translucent upper body (1) and puckered mantle (2).
The white or yellowish white penis (3) is behind the animal’s right tentacle. It greatly enlarges when in use (see 18 Velutina velutina. Sublittoral. Water temperature 3ºC. Norway. January 2013. © E. Svensen. ).

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