. Bulletin. Natural history; Natuurlijke historie. lye^rMs'' PI—' Fig. 2. Diagram showing cusp nomenclature of a typical left upper molar of a uintathere. Hy hypocone. Me metacone. Ml meta- conulid, Pa paraconid, PI protoconule. Ant Cing anterior cingulum. Post Cing posterior cingulum. r£ndcr. Fig. 3. Diagram showing cusp nomencla- ture of a left lower molar of a primitive uintathere. En"* entoco- nid. En* cr entoconid crest, HI"* hy- poconulid, HI* cr hypoconulid crest, Hy* hypoconid. Me* meta- conid, Ms* metastylid. Pa* para- conid, Pr* protoconid. The Lower Cheek Teeth: The lower
. Bulletin. Natural history; Natuurlijke historie. lye^rMs'' PI—' Fig. 2. Diagram showing cusp nomenclature of a typical left upper molar of a uintathere. Hy hypocone. Me metacone. Ml meta- conulid, Pa paraconid, PI protoconule. Ant Cing anterior cingulum. Post Cing posterior cingulum. r£ndcr. Fig. 3. Diagram showing cusp nomencla- ture of a left lower molar of a primitive uintathere. En"* entoco- nid. En* cr entoconid crest, HI"* hy- poconulid, HI* cr hypoconulid crest, Hy* hypoconid. Me* meta- conid, Ms* metastylid. Pa* para- conid, Pr* protoconid. The Lower Cheek Teeth: The lower cheek teeth are as distinctive as the upper. They have high trigonids with prominent metalophids. The paraconid and paraconid crest are reduced, especially in the larger forms where they are but vestiges. A metastylid has formed adjacent to the metaconid as a sort of smaller "; This metastylid is very distinctive and is not present on the M3 of the xenungulate, Carodnia. The heel is low and does not have the typical ungulate hypolophid, as do the Pantodonta. The hypoconid has a crest which extends across the tooth toward the metastylid, but dies out low on its flank without reaching it. This hypoconid crest occludes against the anterior face of the pos- terior loph of the corresponding upper molar. In other words, it fits in the pocket of the V. At the postero-internal corner of the lower teeth is a posterior talonid loph across which the hypocone grinds. The lower cheek teeth have prominent cingula anteriorly and posteriorly. The external cingula are weak or absent. The internal cingulum is strong along the heel but is weak along the trigonid (fig. 3). In contrast to the upper teeth, there is no definitive morphologic distinction. 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 Peabody Mus
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Keywords: ., bookcentury1900, bookcollectionbiodiv, booksubjectnaturalhistory
