. Bulletin - United States National Museum. Science. PLEISTOCENE VERTEBRATES FROM CUMBERLAND CAVE 55 side, occiput more elevated than in the living species, giving a less convex contour to the cranium. Anterior zygomatic region widely- expanded, with its outer rim strongly turned downward and ex- tending forward well beyond the maxillary-premaxillary suture, thus giving an unusually broad surface for the attachment of the anterior portion of the masseter-laterahs. Jugal relatively deep,. FiQUEE ^ {Tamiasciurus) tenuidens Hay, skuU ( no. 8164), and mandible ( no. 12050
. Bulletin - United States National Museum. Science. PLEISTOCENE VERTEBRATES FROM CUMBERLAND CAVE 55 side, occiput more elevated than in the living species, giving a less convex contour to the cranium. Anterior zygomatic region widely- expanded, with its outer rim strongly turned downward and ex- tending forward well beyond the maxillary-premaxillary suture, thus giving an unusually broad surface for the attachment of the anterior portion of the masseter-laterahs. Jugal relatively deep,. FiQUEE ^ {Tamiasciurus) tenuidens Hay, skuU ( no. 8164), and mandible ( no. 12050): a, Dorsal view of skull; 6, lateral view of mandible. X IH. Cumberland Cave Pleistocene, Maryland. about one-fourth deeper than the average in the Hving species. Bullae much as in the Uving members of the group but more inflated back- ward and outward, in posterior portion, giving a decidedly flatter appearance to the posterior wall of its mner face and to the outer face directly below the external auditory meatus. External audi- tory meatus smaller than in living species. Incisors more robust, with greater anteroposterior diameter than in the living species. Cheek-tooth row of equal length with that of Sciurus fremonti, and of S. hudsonicus from the Fort Yukon district, but teeth slightly narrower. - Lower jaw relatively deep, short, and massive, with broadly ex- panded angle. Anterior portion of masseteric fossa deeper and. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
