. Cope papers, 1871-[1897. Zoology; Paleontology. 1879-] Extinct American Rhinoceroses and their Allies. 77^h the tapiroid feature of the non-closure of the auditory meatus below by the posttympanic process ; and the postglenoid process is generally more like that of the tapirs than are those of the later genera Aphelops and Rhinocerus. The form of the femur is also quite characteristic, presenting tapiroid characters again in the shape of the great trochanter. This process is not flat and obliquely truncated as in the genera above named, but is horizon- tal proximally, and with a produced rec
![. Cope papers, 1871-[1897. Zoology; Paleontology. 1879-] Extinct American Rhinoceroses and their Allies. 77^h the tapiroid feature of the non-closure of the auditory meatus below by the posttympanic process ; and the postglenoid process is generally more like that of the tapirs than are those of the later genera Aphelops and Rhinocerus. The form of the femur is also quite characteristic, presenting tapiroid characters again in the shape of the great trochanter. This process is not flat and obliquely truncated as in the genera above named, but is horizon- tal proximally, and with a produced rec Stock Photo](https://c8.alamy.com/comp/PG2B6W/cope-papers-1871-1897-zoology-paleontology-1879-extinct-american-rhinoceroses-and-their-allies-77h-the-tapiroid-feature-of-the-non-closure-of-the-auditory-meatus-below-by-the-posttympanic-process-and-the-postglenoid-process-is-generally-more-like-that-of-the-tapirs-than-are-those-of-the-later-genera-aphelops-and-rhinocerus-the-form-of-the-femur-is-also-quite-characteristic-presenting-tapiroid-characters-again-in-the-shape-of-the-great-trochanter-this-process-is-not-flat-and-obliquely-truncated-as-in-the-genera-above-named-but-is-horizon-tal-proximally-and-with-a-produced-rec-PG2B6W.jpg)
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. Cope papers, 1871-[1897. Zoology; Paleontology. 1879-] Extinct American Rhinoceroses and their Allies. 77^h the tapiroid feature of the non-closure of the auditory meatus below by the posttympanic process ; and the postglenoid process is generally more like that of the tapirs than are those of the later genera Aphelops and Rhinocerus. The form of the femur is also quite characteristic, presenting tapiroid characters again in the shape of the great trochanter. This process is not flat and obliquely truncated as in the genera above named, but is horizon- tal proximally, and with a produced recurved apex and posterior crest, which bound a large fossa. The species are the smallest of the family, the A. mite having the dimensions of the Malayan tapir. In the species of Diceratherium (Marsh) the cranium and limb bones present the characters above ascribed to the Aceratheria. In size they are intermediate between the latter and the Aphelopes. The two American species are known from the beds of the Truckee epoch of Oregon; a third species, D. pleuroceriis (Duv.) has been found in France. Aphelops (Cope) occupies a position intermediate between Accra- theriiim Kaup and Rhinocerus Linn. It agrees with the formei^^in the presence of incisor and canine teeth, and in the absence of indication of a nasal horn, but differs from it in lacking the fifth digit of the anterior foot. In the last respect it is identical with the genus Rhinocerus, differing from it in characters already mentioned, in which it agrees with Aceratheriiim. From Atelodus Pom. it differs still more widely, as that genus wants incisor and canine teeth. The evidence on which this genus rests is furnished by two species, the Aphelops megalodus, and the A.fossiger. In both of these animals, the number of anterior digits is known to be only three and in the former the inferior canines an' alveoli for incisors can be seen in "specimens. In two other eferred to the same genus, ured'in Fig. 3 iC A. crassus and