. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. WOOD AND PATTERSON : OLIGOCENE RODENTS OF PATAGONIA 345 surface is about as wide, proi)ortionately, as in Neoreomys, the expansion of the rostrum in the latter having taken place in the dorsal portion, evidently pari passu with the forward extension of the masseteric fossa. The incisive foramina are wade, much wider than in Neoreomys, and lie together in a fossa that deepens posteriori}' in its maxillary portion, the posterior wall sloping sharply posteroventral to the palate. The fos,sa extends back almost to the lev
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. WOOD AND PATTERSON : OLIGOCENE RODENTS OF PATAGONIA 345 surface is about as wide, proi)ortionately, as in Neoreomys, the expansion of the rostrum in the latter having taken place in the dorsal portion, evidently pari passu with the forward extension of the masseteric fossa. The incisive foramina are wade, much wider than in Neoreomys, and lie together in a fossa that deepens posteriori}' in its maxillary portion, the posterior wall sloping sharply posteroventral to the palate. The fos,sa extends back almost to the level of P"" and slightly beyond that of the anterior root of the zygoma (Fig. 22B). Precisely similar conditions do not appear to exist in any Santa Cruz Fig. 22. Cephalomys. A, Cephalomys plexus Ameghino, dorsal view of left maxilla, no. 3085; B, Cephalomys sp., ventral view of palate, no. 3109 (detail between tooth rows restored from no. 3091, C. plexus), X 3. C, Cephalomys arcidens, lateral view of mandible, no. 3058 (parts in outline from no. 3005, C. plexus), x 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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