surface of the ramus is clipped with a triangle-like pit that wedges towards the bottom to configurate the lower end of the jugal ramus of the postorbital. There are two lacrimal bones preserved from specimens AMNH FARB 30655 and 30656. Overall, the left lacrimal of AMNH FARB 30655 is wedge-shaped in a lateral view, denoting the anterior shape of the orbit, and flattened from the inner side to the lateral one. The top surface is thin and overlapped by the ventral border of the premaxilla joint that is developed from the rear to the bottom. On the bottom surface, a large and elliptical foramen is visible, allowing the connection for the rostral joint of the jugal. On the posterior surface another foramen is present, ending on the ventral surface where the exit is located. These foramina are connected through the lacrimal channel. The right squamosal is labelled as AMNH FARB 30658. The main body is subtriangular with the lateral surface being gently convex. In contrast, its lower inner surface is more concave and cross-cut by a minor ridge-like structure. As a whole, the squamosal is flattened from the inner side to the top. There are three projections coming from the main body, which can be identified as the anterior postorbital joint, the lateral postcotyloid joint and the inner ramus. However, only the lower part of the postorbital joint is preserved. The precotyloid opening is absent, but this feature is very variable in both Hadrosauroidea and Hadrosauridae. Two quadrate bones are preserved (specimens AMNH FARB 30659 and 30660). It is very straight in general with only a gentle curvature on the posterior border. The articular surface of the head is triangle-shaped and flatted to the lateral side. A relatively large, ridge-like formation can be observed on the posterior edge near the top, likely supporting the squamosal. This character is also reported in other iguanodontians and hadrosauroids, such as Brachylophosaurus or Gryposaurus. The lateral surface of the quadrate is flat and on the anterior border a cut for the quadratojugal can be identified, however, most of its articular borders are lost except a small dorsal area and a long bottom surface. A right dentary is represented by specimen AMNH FARB 30654, a partial element with a badly eroded dental battery. It preserves about 15 alveoli of which none is filled with teeth. The total dentary teeth count on Gilmoreosaurus was probably less