. Bulletin - United States National Museum. Science. 68 BULLETIN 171, UNITP^D STATES NATIONAL MUSEUM pelage. In an examination of a series of Recent skulls and jaws in the collections of the U. S. National Museum and U. S. Biological Survey, it was found that they show a wide range of individual and sex variations and that it was apparently not feasible to formulate a series of definite characters that would satisfactorily separate the two species. The specimens from Cumberland Cave Ukewise show considerable variation but apparently not exceeding in any important details the limits of individu
. Bulletin - United States National Museum. Science. 68 BULLETIN 171, UNITP^D STATES NATIONAL MUSEUM pelage. In an examination of a series of Recent skulls and jaws in the collections of the U. S. National Museum and U. S. Biological Survey, it was found that they show a wide range of individual and sex variations and that it was apparently not feasible to formulate a series of definite characters that would satisfactorily separate the two species. The specimens from Cumberland Cave Ukewise show considerable variation but apparently not exceeding in any important details the limits of individual variation seen in modern riQURE 37.—Erethuon cf. dorsatum (Linnaeus): a, Skull ( 7996), lateral view; 6, mandible ( no. 7672), lateral and occlusal views. Two-thirds natural size. Cumberland Cave Pleistocene, Maryland. A remarkably large skull (fig. 37a), no. 7996, in the cave collection is characterized by a noticeably broad frontal region, wide palate, and particularly broad incisors. The incisors appear to be sHghtly wider than in the Recent specimens examined, although other proportions characterizing tliis skull seem to be duplicated in some of the larger of the modern specimens. Order LAGOMORPHA Family OCHOTONIDAE OCHOTONA species Six fragmentary mandibles and three maxillary portions, all carry- ing teeth, are recognized as belonging to a species of Ochotona. With this limited material no important differences can be cited separating. 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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