. Breviora. . 0 5MM Figure 5. Right mandible with functional deciduous premolars (dPj.^) and unerupted jjemianent P2_4; Mj is in process of eruption. Lateral view of PU 13268. pronounced entoconulid is anterior to the entoconid on M2 and Ms, and it is present on Mi in some individuals. Posterior to the hypoconulid, the postcingulid rises in a broad cusphke projec- tion. This is well developed in Mi and M2 and, to a lesser ex- tent, in P4. In Ms the hypoconulid forms a small third lobe. Ms is usually narrower buccolingually than the other molars. The enamel of the molariform teeth is moderately
. Breviora. . 0 5MM Figure 5. Right mandible with functional deciduous premolars (dPj.^) and unerupted jjemianent P2_4; Mj is in process of eruption. Lateral view of PU 13268. pronounced entoconulid is anterior to the entoconid on M2 and Ms, and it is present on Mi in some individuals. Posterior to the hypoconulid, the postcingulid rises in a broad cusphke projec- tion. This is well developed in Mi and M2 and, to a lesser ex- tent, in P4. In Ms the hypoconulid forms a small third lobe. Ms is usually narrower buccolingually than the other molars. The enamel of the molariform teeth is moderately crenulated, particularly in the talonid. A prominent ectocingulid is present on P3-M3 and posteriorly on P2. The posterior premolars and the molars clearly demonstrate a tendency toward polycuspida- tion, a characteristic of the Plagiomenidae. The deciduous premolars preserved in PU 13268, dP2-4 (see Figs. 5 and 6), are in general similar to their adult replace- ments. They possess the same cusps in approximately the same positions but are relatively longer anteroposteriorly and more cqmpressed buccolingually. The talonid of dP2 is more molari- form than in P2, exhibiting both a hypoconid and a small ento- conid. The talonid of dPs is similarly more expanded than that of the replacing tooth. In the trigonid of dPs the paraconid and metaconid are somewhat more distinct and better separated from the protoconid than in the permanent Ps. In dP4 as well, the talonid is elongated and expanded relative to its condition in P4, and the hypoconulid is much more pronounced, almost forming a small third lobe as in 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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