Mantle removed from the nuchal cavity over the head (1); intact but translucent on visceral mass (2) as black pigment rubbed off. Translucent mantle skirt (3). Narrow black mantle over pallial groove containing gills (4). The anterior bundle (5) on each side of the pedal retractor muscle is the largest as they must pull down the shell further to the anterior where bundles are absent. Pericardium containing the heart (6). Dorset, England 2016.