. Entstellung des Meatus spurius und Bedeckung des Mastoid bei Perissodactyla, I Eqiiits, II Tapiriis, III Bhinuceios soiiduictis. Nach Osborn, aus Webeb. ao. äußere Ohröfl'nung: c. Condylus occipitalis; ms. Mastoid; pg. Proc. postglenoideus; fp. Proc. paroccipitalis; pt. Proc. posttyrapanicus; t. Tym- panicum. meatus is formed solely by the tympanic; whereas in both existing ouc-horned species these processes (even in the new-boru animal) are in contact for a eonsiderable space, and in old aniuials ankylosed together, so that the squamosal completely surroimds the meatus as in the elephant [F
. Entstellung des Meatus spurius und Bedeckung des Mastoid bei Perissodactyla, I Eqiiits, II Tapiriis, III Bhinuceios soiiduictis. Nach Osborn, aus Webeb. ao. äußere Ohröfl'nung: c. Condylus occipitalis; ms. Mastoid; pg. Proc. postglenoideus; fp. Proc. paroccipitalis; pt. Proc. posttyrapanicus; t. Tym- panicum. meatus is formed solely by the tympanic; whereas in both existing ouc-horned species these processes (even in the new-boru animal) are in contact for a eonsiderable space, and in old aniuials ankylosed together, so that the squamosal completely surroimds the meatus as in the elephant [Fig. 63, III]. The African rhinoceroses conform with the Sumatran in this respect, though the groove is not so wide; so that this conformation of the squamosal may be said to characterize all the existing two-horned species« (Flower, 1876). Auch bei den ausgestorbenen Gruppen treten dieselben Unter- schiede auf und zwar so, daß größere Vollkommenheit des Meatus spurius und geringere Bedeckung des Mastoid ein Beweis größerer Spezialisierung sind. Als Merkmale des Vorläufers der Rhinocero- tidae nennt Osborn (189S); »the external auditory meatus [spurius] was widely open below; the post-tympanic portion of the squamosal had a short styliform process; between tbis dement and the ex- occipitals was probably a eonsiderable exposure of the mastoid portion of the periotic bone (present in Amyiiodon., wanting in Hy-
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