Diagram of the mouth of a snail, showing the lingual ribbon. br, brain; c, buccal cavity; co., caelom; g, gullet; j, jaw, against which the radula works; m, mouth; r., radula; r.s., radula sac, in which the radula is renewed as it is worn away in front.

Snail

Diagram of the mouth of a snail, showing the lingual ribbon. br, brain; c, buccal cavity; co., caelom;…