1: mantle-skirt translucent buff; colour most saturated and translucency least when skirt retracted from shell-periphery.
2: pallial tentacles not fully extended but opaque, chalky-white colour makes them still obvious against duller mantle skirt.
3: sole of foot black (colour saturation increased as foot contracted).
4: pedal-retractor muscle attaches body/foot to shell.

OTHER SPECIES ALBUMS
marinvert.senckenberg.science/image-browse/