. The Ceratopsia. Ceratopsia. 74 THE CERATOPSIA. bar of the parietal. It is but 170 mm. in length, and indicates that the squamosals were short, not very broad, and rather inconspicuous as compared with the same elements in some other contemporaneous and later forms. Among the latter may be mentioned more especially Tri- ceratops. Cope's description of the squamosals is somewhat indefinite and does not appear to have been based on any material pertaining to the type. The left frontal bone (No. 3997, American Museum of Natural History) mentioned by Cope does not, I am satisfied, belong to the s
. The Ceratopsia. Ceratopsia. 74 THE CERATOPSIA. bar of the parietal. It is but 170 mm. in length, and indicates that the squamosals were short, not very broad, and rather inconspicuous as compared with the same elements in some other contemporaneous and later forms. Among the latter may be mentioned more especially Tri- ceratops. Cope's description of the squamosals is somewhat indefinite and does not appear to have been based on any material pertaining to the type. The left frontal bone (No. 3997, American Museum of Natural History) mentioned by Cope does not, I am satisfied, belong to the same but to a smaller and younger individual than the pari- etals just described. This conclusion is borne out by the fact that Cope made no mention of this remarkably characteristic element in his original description of the species, and only associated it with the type in his subsequent paper published thirteen years later. Not only is the border for contact with the parietal shorter than that in the parietals, but the color, texture, surface markings, and general conformation of the bone all indicate that it pertained to an individual distinct from that to which the parietals pertained. I believe that any characters it may present should not be considered as certainly diagnostic of the present species, for its specific identity must, for the present at least, re- main uncertain. I describe and figure this element in this connection not out of re- gard for any certain additional characters it may furnish distinctive of the present genus and species, but rather for the infor- mation which it affords relative to the homologies of certain cranial elements in the Ceratopsia as a group. It may be de- scribed as consisting of both those elements which have been described and figured by Marsh" as the frontals and postfrontals, but without the slightest indication of a fronto-postfrontal suture, although the sutures for the parietal, squamosal, jugal, prefrontal, and opposing fro
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