. Bulletin. Natural history; Natuurlijke historie. 36 PEABODY MUSEUM BULLETIN 28. FIGURE 1. Jaw and teeth of Phiomys andrewsi. Jaw X 5, teeth X 10. A. Lateral view of left lower jaw, YPM 18071. B. Right P4-M3, AMNH 13275, holotype. C. Left Ml, YPM 18060. D. Left P^-M^, YPM 18071. E. Left M^, AMNH 13274. F. Right dP,-M,. YPM 18064. G. Right dP^-Mj, AMNH 13271. H. Right M2, YPM 18076. ing coronoid process shown by Osborn (1908, fig. 4) would be very distinctive, if, as seems unlikely, the figure is correct. In Osborn's figure, the coronoid process passes the alveolar border at the rear of M2, wh
. Bulletin. Natural history; Natuurlijke historie. 36 PEABODY MUSEUM BULLETIN 28. FIGURE 1. Jaw and teeth of Phiomys andrewsi. Jaw X 5, teeth X 10. A. Lateral view of left lower jaw, YPM 18071. B. Right P4-M3, AMNH 13275, holotype. C. Left Ml, YPM 18060. D. Left P^-M^, YPM 18071. E. Left M^, AMNH 13274. F. Right dP,-M,. YPM 18064. G. Right dP^-Mj, AMNH 13271. H. Right M2, YPM 18076. ing coronoid process shown by Osborn (1908, fig. 4) would be very distinctive, if, as seems unlikely, the figure is correct. In Osborn's figure, the coronoid process passes the alveolar border at the rear of M2, whereas in YPM 18071 (fig. 1 A) it passes it at the rear of M3. This, however, is because the former specimen is a juvenile and the latter is an adult, and in each one, the coronoid arises by the rear of the tooth row. There is a single small mental foramen high on the man- dible, just in front of the anterior root of P4. In adult specimens, there is a cor- rugated area behind M3, median to the coronoid and above the alveolus of the incisor that is absent in juveniles. The lower premolar is present on the holotype (fig. 1 B), and on YPM 18071 (fig. 1 D). The protoconid and metaconid are close together, as in paramyids, and the metaconid is considerably higher than the protoconid. In the holotype, these cusps are united at the front of the tooth by anterior ridges, as well as at their rear to form a metalophid. In the second specimen, only the second of these ridges is present, the anterior arm of the metaconid extending along the. 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 Museum of Natural History. New Haven : The Museum
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