FIGURE 24. Sphenodon tongue and adductor chamber (BMNH1972.1223) in dorsal view. 24.1 Close up of the adductor chamber showing a cross-section through the jaw muscles (24.2, 24.3) as indicated by the white box. Note that in 24.2 and 24.3 the anterior part of the articular surface is hidden by the adductor muscles. Scale equals 5 mm.