Fig. 8. Movements of the odontophore relative to the buccal mass during biting versus swallowing. (A) Biting (black lines) and swallowing (gray lines) data showing averaged rotation of the anterior border of the I6 relative to the jaw line (black and gray lines, respectively, in (B). (C) Biting (black lines) and swallowing (gray lines) data showing translation of the anterior tip of the odontophore relative to the jaw line (black and gray lines, respectively, in (D). In C, the gray horizontal line indicates the location of the jaws (corresponding to 0 mm). When the data lie above this line, the radula and underlying odontophore are protruding through the jaws. Note that the averaged swallows do not cross this line, whereas the averaged bites do cross it. Values in A and C are means (solid lines) ± 1 s.d. (broken lines).