. The Ceratopsia. Ceratopsia. Fig. 12.—Superior view of frill of Torosaurus gladius (type), No. 1831, Yale Museum, p, Parietal; sq, squamosal; pf, parietal fontanelle sf supratemporal fossa; pfs, surface for contact with postfrontal; x, foramen analogous to the postfrontal foramen in Triceratops. One-sixteenth natural size. and Torosaurus latus or T. gladius, as shown in the accompanying figures. It is broad anteriorly and narrows posteriorly. The posterior and inferior border is undulating and supported six small pointed dermal ossicles (epoccipitals), as shown in fig. 10. The external surfac
. The Ceratopsia. Ceratopsia. Fig. 12.—Superior view of frill of Torosaurus gladius (type), No. 1831, Yale Museum, p, Parietal; sq, squamosal; pf, parietal fontanelle sf supratemporal fossa; pfs, surface for contact with postfrontal; x, foramen analogous to the postfrontal foramen in Triceratops. One-sixteenth natural size. and Torosaurus latus or T. gladius, as shown in the accompanying figures. It is broad anteriorly and narrows posteriorly. The posterior and inferior border is undulating and supported six small pointed dermal ossicles (epoccipitals), as shown in fig. 10. The external surface for some distance inside this border is very gently concave, but above this it is uniformly convex. The parietal suture is open throughout the entire length of the bone, and the parietal border is heavy. Anteriorly the squamosal is in contact with the quadrate, the exoccipital, the jugal, and the postfrontal, and for a limited extent with the quadratojugal, besides sending a strong process underneath the parietal. It overlaps the external surfaces "of all these bones and has a very extended contact, especialty with the postfrontal, through which it forms the chief support posteriorly and interiorly to the massive supraorbital horn. On the inner side, near its anterior end, the surface of the squamosal is crossed obliquely by a heavy ridge of bone, presenting anteriorly an abrupt shoulder, against which the distal extremity of the exoccipital process. Fig. 13.—Superior view of parietal of type of Monoclonius crassus, No. 3998, American Museum of Natural History, sqs, Surface for articulation with squamosal; pfs, surface for postfrontal. One-eighth natural Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hatcher, J. B. (John Bell), 1861-1904; Lull, Richard Swann, 1867-1957; Osborn, Henry Fairf
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