. Bulletin. Natural history; Natuurlijke historie. EARLY CENOZOIC MAMMALIAN FAUNAS, FAYUM 63. FIGURE IL Upper cheek teeth of Metaphiomys schaubi, X 10. A. Right dP^-M^ YPM 18228, anterior end to the right. B. Left dP^-M^, YPM 21320. C. Left dP^ YPM 21331. D. Left M^--, YPM 18005. E. Right M^ YPM 21331, anterior end to the right. F. Left MS YPM 21331. enlargement of the middle of the mesoloph. The anterior cingulum extends lingually on dP^ (fig. 11 A-C), but this does not occur on the molars. There often is a faint ridge, made up of one or more cuspules, on the posterior slope of the protoloph
. Bulletin. Natural history; Natuurlijke historie. EARLY CENOZOIC MAMMALIAN FAUNAS, FAYUM 63. FIGURE IL Upper cheek teeth of Metaphiomys schaubi, X 10. A. Right dP^-M^ YPM 18228, anterior end to the right. B. Left dP^-M^, YPM 21320. C. Left dP^ YPM 21331. D. Left M^--, YPM 18005. E. Right M^ YPM 21331, anterior end to the right. F. Left MS YPM 21331. enlargement of the middle of the mesoloph. The anterior cingulum extends lingually on dP^ (fig. 11 A-C), but this does not occur on the molars. There often is a faint ridge, made up of one or more cuspules, on the posterior slope of the protoloph (fig. 11 A, D). The metaloph unites with the middle of the posterior cingulum on dP^ to M-, usually before wear, though exceptions occur (fig. 11 C, F). The metaconule usually extends forward as a prominent spur. A similar spur may (fig. 11 A, M-) or may not (fig. 11 A, M^) arise from the proto- conule. On one specimen (fig. HE) there is a spur extending backward from the protoconule. The anterior half of M^ is similar to the corresponding parts of M^-^ xhe protocone curves posteriorly along the median margin of the tooth. The mure forms a crest which is usually (fig. 12 A), but not always (fig. 12 B), a straight line to the posterior end of the tooth. From the middle of the mure, a crest extends buccad toward the posterobuccal part of the tooth where there is a distinct metacone. In two of the four specimens, this crest unites with the meta- cone in a manner that makes it look like a metaloph (figs. 11 A, 12 B), but in the other two it seems to be distinct and to represent a mesoloph (fig. 12 A).. 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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Keywords: ., bookcentury1900, bookcollectionbiodiv, booksubjectnaturalhistory
