. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 16. Cephalomys arcidens Ameghino. uo. 3160, LM^ ""^ -, x 5; A, crown, and B, anterior views. l^araflexus in that order. The anteroloph and protoloph unite at the buccal margin of the tooth a short distance below the apex of the crown so that the parafossette is isolated soon after wear begins. The protoloph and metaloph (or its vestige) unite eon- sitlerably farther down, the mesofossette becoming isolated about the time the lingual neofossette disappears (ef. no. 29558 or no.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 16. Cephalomys arcidens Ameghino. uo. 3160, LM^ ""^ -, x 5; A, crown, and B, anterior views. l^araflexus in that order. The anteroloph and protoloph unite at the buccal margin of the tooth a short distance below the apex of the crown so that the parafossette is isolated soon after wear begins. The protoloph and metaloph (or its vestige) unite eon- sitlerably farther down, the mesofossette becoming isolated about the time the lingual neofossette disappears (ef. no. 29558 or no. P14652, Fig. 14A), or later (Fig. 16A). The mure is slightly angulate, but shows no thickening that would suggest the presence of a mesocone. In addition to giving us the crown pattern of an upper molar of a member of this genus, these teeth are interesting because of the similarity — apart from the neoloph — to the unworn molars of Nroreomys (Fig. 17A). In the latter, there is also a fifth crest, but this seems to be a normal neoloph, a development from the posterolophid, as in Protosteiromys, since it is connected at both. 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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