1: Chemoreceptor, ovoid rhinophores with vertical lamellae.
2: Distal surface of partly-opened, folded cephalic shield.
3: Ventrally positioned half of proximal surface of cephalic shield.
4: Orange mouthparts in non-feeding, contracted condition.
5: Circular oral veil.
6: Sole of foot.
This image shows that the mouth is below the shield; so the shield cannot be part of the foot as claimed on several websites (accessed March 2018).
Length 19.4 mm Ventral view. Sublittoral, Orkney, Scotland. May 2017. Leg. S. Taylor.