. Bulletin. Natural history; Natuurlijke historie. EARLY CENOZOIC MAMMALIAN FAUNAS, FA YUM 61. FIGURE 10. Lower teeth of Metaphiomys schaubi, X 10. A. Left dP,-M„, YMP 21295. B. Right M3, YPM 21331, anterior end to right. C. Right, Mi YPM 18220. D. Left U^-^, YPM 21301. E. Right Mi_3, YPM 21310. (fig. 9 G). This is seen in YPM 18232 (which is unusual in the large size of the hypoconulid, foreshadowing the condition in M, beadnelli) and in YPM 18002, 18225, 18230, 21299, 21308, 21312, 21321 and 21329. A very similar pattern is seen in YPM 21311 where there is, in addition, a faint ridge on the
. Bulletin. Natural history; Natuurlijke historie. EARLY CENOZOIC MAMMALIAN FAUNAS, FA YUM 61. FIGURE 10. Lower teeth of Metaphiomys schaubi, X 10. A. Left dP,-M„, YMP 21295. B. Right M3, YPM 21331, anterior end to right. C. Right, Mi YPM 18220. D. Left U^-^, YPM 21301. E. Right Mi_3, YPM 21310. (fig. 9 G). This is seen in YPM 18232 (which is unusual in the large size of the hypoconulid, foreshadowing the condition in M, beadnelli) and in YPM 18002, 18225, 18230, 21299, 21308, 21312, 21321 and 21329. A very similar pattern is seen in YPM 21311 where there is, in addition, a faint ridge on the anterior side of the hypolophid, extending toward the protospur. In a few specimens (YPM 18014 and 18229) the pattern is the same as in the common type except that the posterior arm of the protoconid reaches the lingual border of the tooth (fig. 9 B) rather than there being a spur from the metaconid. The iso- lated Mo of YPM 21331 and Mo of YPM 21330 are of the common type with the addition of a faint backwardly directed ridge from the middle of the meta- lophid. Another variant occurs in YPM 18222, where there is a crest from the hypolophid that runs just laterad of the protospur, very nearly closing the valley between the protospur and the ectolophid. In the holotype (fig. 9 A) and in YPM 18229 and 21319, the anterior half is of the usual pattern, but there is a posteriorly directed crest from the middle of the hypolophid, similar to the protospur. This latter crest is present, but very weak, in YPM 18223 and 21307. The tooth of YPM 18001 is generally similar to that of the holotype, but there are several minor ridges radiating from the posterior arm of the protoconid, and the posterior basin is partly dammed by a crest from the hypoconulid, as. 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
