. Carnegie Institution of Washington publication. «4 FOSSIL OF NORTH AMERICA. is larger than that of the other species, the horizontal diameter heing l\ mm. The perpen- dicular diameter is now only 16 mm., but this is due, no doubt, to crushing. From the orbit to the tympanic cavitv is 22 mm. The rooting of the temporal region resembles that of E. cephalica. Few of the sutures of the upper side of the skull can be traced with certainty; but it is evident that the parietal union with the squamosal had been severed by the excavation in the hinder border of the roof. There are reasons f
. Carnegie Institution of Washington publication. «4 FOSSIL OF NORTH AMERICA. is larger than that of the other species, the horizontal diameter heing l\ mm. The perpen- dicular diameter is now only 16 mm., but this is due, no doubt, to crushing. From the orbit to the tympanic cavitv is 22 mm. The rooting of the temporal region resembles that of E. cephalica. Few of the sutures of the upper side of the skull can be traced with certainty; but it is evident that the parietal union with the squamosal had been severed by the excavation in the hinder border of the roof. There are reasons for believing that the parietals were each 15 mm. wide posteriorly. If the prefronto-nasal suture is where it seems to be, the nasals were unusually large, running along the midline 8 mm. The parieto-frontal and the fronto-prefrontal sutures can not be deter- mined with certainty. The nasal opening has now a width of 23 mm. One premaxilla is present and has the height and the width each 9 mm. The maxilla, below the orbit, is 11 mm. wide, being thus narrower than that of E. cephalica. The upper surface of the skull is rough with narrow ridges, separated by sharp furrows. This interferes with the tracing of the sutures; for the latter do not appear to be really absent. Occasional narrow grooves indicate that the skull was covered with horny plates; but these can not be 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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