. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. WOOD AND PATTERSON : OLIGOCENE RODENTS OF PATAGONIA 311 Horizon and locality. Deseado formation; Cabeza Blaiica, Chubut. Diagnosis. Metalophid entirely absent; teeth slightly larger and molars somewhat hig'her-erowned than in D. aromhowgi; mesoflexid deeper than in D. aramhourgi; metafiexid fairly shal- low, so that lingual ends of hypolophid and posterolophid ap- proach more closely than in D. aramhourgi. The cheek teeth (Fig. 7A) are medinm-crowned, but, as in Adclphomys and Stichoniys, show no indications of unilat
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. WOOD AND PATTERSON : OLIGOCENE RODENTS OF PATAGONIA 311 Horizon and locality. Deseado formation; Cabeza Blaiica, Chubut. Diagnosis. Metalophid entirely absent; teeth slightly larger and molars somewhat hig'her-erowned than in D. aromhowgi; mesoflexid deeper than in D. aramhourgi; metafiexid fairly shal- low, so that lingual ends of hypolophid and posterolophid ap- proach more closely than in D. aramhourgi. The cheek teeth (Fig. 7A) are medinm-crowned, but, as in Adclphomys and Stichoniys, show no indications of unilateral hypsodonty. As in the type species, Mo is the largest tooth. M^ (as determined from the alveolus) was the smallest of the series. P4 appears to have been about the size of Mi, which is an ad- vanced character. There is no trace in either molar of any rem-. 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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