. Bulletin. Natural history; Natuurlijke historie. 64 PEABODY MUSEUM BULLETIN 28. FIGURE 12. Incisors and upper and lower cheek teeth of Metaphiomys schaubi, and upper incisor of Metaphiomys sp., x 10. A. Left M^ YPM 21331. B. Left M', YPM 21331. C. Occlusal surface of left P, YPM 18210. D. Posterior end of same specimen as fig. 12 C. E. Cross section of left L, YPM 18088. F. Left dP,. YPM 21323. G. Occlusal surface of right P, YPM 18212. Metaphiomys sp. H. Left Mi-a. YPM 21328, M. schaubi. There is an elevated posterior cingulum running from the posterior end of the mure to the metacone and s
. Bulletin. Natural history; Natuurlijke historie. 64 PEABODY MUSEUM BULLETIN 28. FIGURE 12. Incisors and upper and lower cheek teeth of Metaphiomys schaubi, and upper incisor of Metaphiomys sp., x 10. A. Left M^ YPM 21331. B. Left M', YPM 21331. C. Occlusal surface of left P, YPM 18210. D. Posterior end of same specimen as fig. 12 C. E. Cross section of left L, YPM 18088. F. Left dP,. YPM 21323. G. Occlusal surface of right P, YPM 18212. Metaphiomys sp. H. Left Mi-a. YPM 21328, M. schaubi. There is an elevated posterior cingulum running from the posterior end of the mure to the metacone and surrounding a basin. The point where the mure meets the posterior border of the crown may be extended lingually as an in- cipient hypocone. The anterior tooth (P^ or dP^) is very small with indistinctly separable cusps on its crown. It is similar to the corresponding tooth in most paramyids (Wood, 1962a, figs. 10 D, E; 22 C; or 66 C) and seems to consist of two cusps with a posterior cingulum. The tooth extends only about half way down the anterior face of dP*. The available data offer no evidence as to whether it is dP^ or P^. The frequent absence of this tooth in fossil paramyids (although the alveolus is always present) suggests that the tooth was much less well attached in the jaw than were the molars, which may indicate that it is a retained deciduous tooth. Schlosser (1911, p. 91) gives the dental formula of Ph. andrewsi as \ Neither in his text nor on his figure (pi. 13, fig. 10 a) is it suggested that any trace of the alveolus of this tooth was present, but it may have been overlooked because of its small size and because there is no P^ in the Theridomyidae, to which group Schlosser was. 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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