The parts of an octopus are tentacales and its beak and its head and don't forget the suction cups. :
Octopus's body showed the typical cystic; head and body boundaries is not obvious, there is a large compound eyes and eight retractable wrist. Each have two rows of fleshy wrist sucker, can effectively grip other thing. The base of the wrist called the skirt with webbed organization linked to the center of a mouth. I have a pair of sharp horny palate and file-like radula to drill broken shells, scraping eat its flesh.
There are three hearts and eyes and 8brachiopods.