. The Ceratopsia. Ceratopsia. Fig. 103.—Supraorbital horn cores of the type of Ceratops montanus Marsh (No. 2411, U. S. National Museum) in their proper position. A, O blique back view; B, anterior view. One-fourth natural size. from Monoclonius crassus, for such striking differences as are shown in these two types of frontal horn cores are certainly suggestive of other and even more important structural differences in the skull and other portions of the skeleton. However, the full discussion of such questions must be left for that portion of this volume devoted to a revision of the genera and
. The Ceratopsia. Ceratopsia. Fig. 103.—Supraorbital horn cores of the type of Ceratops montanus Marsh (No. 2411, U. S. National Museum) in their proper position. A, O blique back view; B, anterior view. One-fourth natural size. from Monoclonius crassus, for such striking differences as are shown in these two types of frontal horn cores are certainly suggestive of other and even more important structural differences in the skull and other portions of the skeleton. However, the full discussion of such questions must be left for that portion of this volume devoted to a revision of the genera and species. The squamosal figured by Marsh6 as pertaining to Ceratops montanus, but originally described in the above quotation as a dermal plate, was found by the present writer many miles from the locality which furnished the type. It may or may not pertain to that genus and species. Judging, however, from the character of the squamosal in Ceratops (Monoclo- nius) canadensis Lambe, where the supraorbital horn cores are strikingly similar to those of the present species, it seems probable that Marsh was in error in referring this squamosal to C. montanus. a In figuring the type of Ceratops montanus, Marsh mistook the external lateral view of the supraorbital horn core for the posterior. For- tunately a portion of the orbit is present, making it possible to determine the position of the horncores with certainty. In fig. 103 these horn cores are shown in their proper positions, which is somewhat different from that assigned them by Professor Marsh. b Am. Jour. Sci., vol. 43, 1892, pi. iii, fig. 3. This monograph, PI. I, fig. 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 Fairfield, 1857-1935; Marsh, Othniel Charles, 1831
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