1: flat, strap-like (when live) penis attached sub-dorsally behind right tentacle; recurved up to 360°. 2: folded mantle in siphonal canal forms inhalent siphon. 3: opening of inverted proboscis. 4: posterior of opercular disc set well back from edge of operculum (posterior pointing forwards in image as foot folded in withdrawal position). 5: anterior of operculum embedded in opercular groove exuding it.