. Bulletin of the British Museum (Natural History), Geology. 414 A. W. GENTRY. Fig. 31 Occlusal view of P3 M3 in left mandible of Dicerorhinus Anterior side to the left, x 0-5. The pair of I2s in later wear have retained more of their roots than the unworn one and these roots are more or less straight. The unworn incisor may have a more curved course of its crown and root but this is very uncertain. Each lower jaw has preserved nearly all of its vertical ramus. The angle of the jaws projects or bulges a little posteriorly. The lower edges of the horizontal rami are very slightly conve
. Bulletin of the British Museum (Natural History), Geology. 414 A. W. GENTRY. Fig. 31 Occlusal view of P3 M3 in left mandible of Dicerorhinus Anterior side to the left, x 0-5. The pair of I2s in later wear have retained more of their roots than the unworn one and these roots are more or less straight. The unworn incisor may have a more curved course of its crown and root but this is very uncertain. Each lower jaw has preserved nearly all of its vertical ramus. The angle of the jaws projects or bulges a little posteriorly. The lower edges of the horizontal rami are very slightly convex in outline, but only is visible as far forwards as diastema level. The back of the symphysis in is about level with the back of P1. The postcranial bones are further considered on p. 423, following the comparisons of cranial and dental remains. Groups used in comparisons. In order to identify and understand these remains, comparisons were made with fossils and illustrations of the following Eurasian and African rhinoceroses: 1. Ronzothehum Aymard, mainly from the illustrations of Brunet (1979), Heissig (1969) and Roman (1912). This was the earliest rhinoceros in Europe at localities like Ronzon and survived until the end of the Oligocene. 2. Diceratherium pleuroceros (Duvernoy), a small rhinoceros from the Upper Oligocene and basal Miocene of Europe. It has two horns side by side at the front of its nasals. Upper cheek teeth in middle wear are illustrated in Piveteau (1958: 440, fig. 77), lowers in Roman (1912: pi. 6, figs 4-6). 3. The hornless rhinoceros Aceratherium Kaup, mainly as illustrated in Guerin (1980), Bonis (1973) and Heissig (1969). It is first known in Europe in the middle of the Oligocene. The small Agenian 'Dicerorhinus tagicus (Roman), possibly conspecific with Protaceratherium minutum (Cuvier) as used by Abel (1910: pi. 2, fig. 8), has crochets on its upper molars, at least in earlier wear, and no fifth metacarpal (Roman 1924). It could be an
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