. Bulletin of the British Museum (Natural History), Geology. 6o UPPER EOCENE MAMMALIA M2, it has been concluded that an isolated molar (paratj^e) of D. hopwoodi is best considered as Mi. This latter tooth is elongated with a rounded margin. The protoconid and metaconid are subequal, opposite and transversely crested. The small but distinct low median paraconid forms the sharp anterior apex of the tooth. There is a moderately strong antero-external cingulum and a smaller antero-intemal cingulum. The entoconid and hjrpoconid are vestigial, appearing as small swellings on a low curved crest which
. Bulletin of the British Museum (Natural History), Geology. 6o UPPER EOCENE MAMMALIA M2, it has been concluded that an isolated molar (paratj^e) of D. hopwoodi is best considered as Mi. This latter tooth is elongated with a rounded margin. The protoconid and metaconid are subequal, opposite and transversely crested. The small but distinct low median paraconid forms the sharp anterior apex of the tooth. There is a moderately strong antero-external cingulum and a smaller antero-intemal cingulum. The entoconid and hjrpoconid are vestigial, appearing as small swellings on a low curved crest which forms the postero-intemal talonid margin. The median hjrpoconulid projects slightly posteriorly; the entoconid and hjrpoconid are opposite each other. The talonid is slightly basined. M3 is almost the same length as Ml, with a subequal and opposite protoconid and metaconid. The smaller paraconid is strongly internal and anterior to the metaconid; the trigonid appears antero-posteriorly compressed. The almost straight antero-external trigonid margin is formed by a paraconid and protoconid crest. There is a small antero-external cingulum but the antero-internal cingulum is absent. The vestigial h3rpoconulid is represented by a minute rounded median lobe which is posteriorly projecting and separated from the larger hypoconid. The entoconid is vestigial; a low rounded crest runs anteriorly from the hypoconulid-lobe, forming the postero-internal tooth margin. The talonid is only very slightly basined. Remarks. In the canine of the holotype ( M26052) distinct wear facets are visible: part of the postero-external face has been gauged away by the upper canine in occlusion, to form above alveolar level, a prominent oblique baso-exteriorly directed shelf. Wear has taken place along the whole vertical length of the tooth from the tip to this shelf, but becomes progressively greater towards this latter position; presumably slight wear took place near the canine tip when the tooth was
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