The dentary bone bears 17 curved teeth that decrease in size posteriorly.
The dentary lies external to the angular and extends from the mentomecklian to approximately the mid-length of the angular.
Such an insertion leaves unexplained the great dorsal production of the dentary, surangular and coronoid.
The angular and dentary of the lower jaw appear concurrently with the dentigerous bones.
In the surangular part, immediately posterior to the end of the dentary, is the large surangular foramen.
Lower jaw composed of dentary bone only, articulating only with the squamosal.
These are the articular, angular, dentary, and splenial (coronoid).
Rotula, rot′ū-la, n. the patella or knee-pan: one of the five radial pieces in the dentary apparatus of the sea-urchin.
Ventrally, the posterior part of the dentary underlies the splenial, which is set in a median trench within the dentary.
In Mammalia the dentary is the only element present (vide p. 590).