The term "cephalopoda" refers to these 2 body parts
These cells, called chromatophores, are responsible for the ability of the... [DOC] [TLE] cephalopoda - Man and Mollusc [PAR] CLASS CEPHALOPODA ... to several feet (2- 4 meters) in length; however, the 
giant squids ... As the animal grows, it periodically moves forward, and the 
posterior part of its mantle ...