Editing Nautilus (section)

===Digestive system===
The [[radula]] is wide and distinctively has nine teeth.

The mouth consists of a [[cephalopod beak|parrot-like beak]] made up of two interlocking jaws capable of ripping the animal's food— mostly crustaceans— from the rocks to which they are attached.<ref name=grif>{{Cite book
|title=The anatomy of ''Nautilus pompilius''
|last=Griffin
|first=Lawrence E.
|volume=8
|year=1900
|publisher=Government Printing Office
|place=Washington, D.C.
|url={{google books |plainurl=y |id=IHJBAQAAIAAJ}}
|oclc=18760979
|doi=10.5962/bhl.title.10466
}}</ref>{{rp|p. 105}} Males can be superficially differentiated from females by examining the arrangement of tentacles around the buccal cone: males have a [[Spadix (zoology)|spadix]] organ (shaped like a spike or shovel) located on the left side of the cone making the cone look irregular, whereas the buccal cone of the female is [[Symmetry in biology|bilaterally symmetrical]].<ref name=grif/>{{rp|pp. 115–130}}

The crop is the largest portion of the digestive tract, and is highly extensible. From the crop, food passes to the small muscular stomach for crushing, and then goes past a digestive caecum before entering the relatively brief intestine.