The head has a large, semicircular oral veil anterior to a large oral opening with wrinkled edges. 1: head a veil mostly retracted behind foot. Yellow surrounds of mouth shows faintly through foot. 2: veil more extended with front edge of the veil characteristically folded down on right and left. 3: more of veil and part of yellow mouth surrounds exposed. 4: veil and wrinkled mouth fully exposed. Outer Hebrides, Scotland. April 2018. Leg. D. McKay & S. Taylor.