Fig. 20 in Crania of Tyrannosaurus and Allosaurus

Fig. 20. Tyrannosaurus rex. Amer. Mus. No. 973. Inner view of left dentary, with the splenial and supradentary absent. The small rugose plates between the teeth are outgrowths of the dentary alveolar borders. Below them is a groove for the bloofl vessel supplying the roots of the teeth (see Fig. 13).