. Cope papers, 1871-[1897. Zoology; Paleontology. TJ^c Extinct American Rhinoceroses and their Allies. [December^ The posttympanic process is, it is well known, well separated from the postglenoid process in the . tapir, so as to leave the auditory meatus widely open below. The arrangement is similar in Hyracodon. In Rhinocerus, as shown by Flower, the meatus is closed below by the coossification of the two processes. In the oldest genus of the family Acerafherium, the relations of the parts are as in Hyracodon. In Aphelops the two processes approach each other, but do not come in close contac
. Cope papers, 1871-[1897. Zoology; Paleontology. TJ^c Extinct American Rhinoceroses and their Allies. [December^ The posttympanic process is, it is well known, well separated from the postglenoid process in the . tapir, so as to leave the auditory meatus widely open below. The arrangement is similar in Hyracodon. In Rhinocerus, as shown by Flower, the meatus is closed below by the coossification of the two processes. In the oldest genus of the family Acerafherium, the relations of the parts are as in Hyracodon. In Aphelops the two processes approach each other, but do not come in close contact as in the genus Fig. -Aphelops tnegalodus Cope, one-sixth natural size. lx)up Fork l)eds, Colorado. The postglenoid process is low and transverse in the tapirs; in Rhinocerus it is long and has a triangular section. In some spe- cies of American Aceratheria its form is much like that of the tapirs {A. mite, A. occidentale^; while in Diceratheiium pacificum and in the species of Aphelops, the form of this process is as in RhinoceiiLS. In the tapirs, the foramina sphenoorbitale and rotundum are dis- tinct. They are also distinct in Aceratheriiun mite. In D. pacifi- cum they are confluent, but the walls of their orifice present two opposite projections, which are the rudiments of a dividing sep- tum. In Aphelops these foramina are one as in Rhinocerus. At the same time, the external wall of the alisphenoid canal is shorter and thinner in the Aceratheria than in the Aphelopes. In the older types of Perissodactyla, e. g., Symborodon, the foramen ovale is situated well in advance of the foramen lacerum medius, and is separated from it by a considerable space of the sphenoid bone. The same structurf i*; ';ppn in Mvynmrln^i anrl in. 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 Cope, E. D. (Ed
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