Everted feeding proboscis (1) turned to show its right side. Mouth (3).  Pink buccal mass (2).  Accessory boring organ, ‘ABO’ (4) on ventral face of proboscis tip. Anterior of propodium folded so its right and left halves (5) can hold a bivalve firmly against the ABO. Posterior of propodium (6). No bivalve in image but features disposed in feeding position. Llŷn Peninsula, Wales, September 2015. Leg. P. Brazier.