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THE SKULL OF REPTILES
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Fig. 17. Diadectes (Nothodon). Cotylosaur: left mandible, from within. One half natural size.
Fig. 18. Pantylus. Cotylosaur: A, right mandible from inner side; B, the same from above; C, the same from below; D, sections corresponding to letters.
The splenial (sp), entering into the Meckelian symphysis primitively (Figs. 15–18), extending back to the posterior inferior Meckelian foramen, articulating with the dentary, coronoid, prearticular, and angular, is not infrequently absent. In Pantylus (Fig. 18) only, so far as known, the postsplenial corresponds to its posterior part as in the known Stegocephalia (Fig. 15). It [the splenial] never bears
