Figure 1: Octopus digestive tract. lip: lip, bma: buccal mass, asg: anterior salivary gland, oes: oesophagus, psg: posterior salivary gland, dgl: digestive gland, crp: crop, an: anus, dda: digestive duct appendages, dgd: digestive gland duct, int: intestine, cae: caecum, st: stomach. (Bidder, 1966).