. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 334 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY somewhat below the level of the rest of the crown, is a small cuspule, from which a short crestlet runs antero-linguallj^ By comparison of this tooth with the slightly worn first or second upper molars of C. arcidens shown in Figures 15B and C, this cusp would appear to be the metacone, and the crestlet running from it to be the last stage in the degeneration of the buccal part of the metaloph. In the specimens shown in Figures 15B and C, the metaloph is complete and five c
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 334 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY somewhat below the level of the rest of the crown, is a small cuspule, from which a short crestlet runs antero-linguallj^ By comparison of this tooth with the slightly worn first or second upper molars of C. arcidens shown in Figures 15B and C, this cusp would appear to be the metacone, and the crestlet running from it to be the last stage in the degeneration of the buccal part of the metaloph. In the specimens shown in Figures 15B and C, the metaloph is complete and five crests are present. This may be a specific character, but is probablj^ an individual vari- ant, since, in upper molars of Neoreomys australis (Fig. 17A), and especially in M'^, the metaloph exhibits various stages of dis- integration. The neoloph in Cephalomys has split the metafos- sette into two parts, the posterior one (which may be termed 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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