. Catalogue of the mammals of Western Europe (Europe exclusive of Russia) in the collection of the British museum. Mammals. SCIUROPTERUS 943 less of the surface of parietal is visible ; occiput very low, its height above lower lip of foramen magnum about one-half mastoid breadth, its dorsal and lateral margins forming a flattened curve much less than a semicircle in extent ; foramen magnum decidedly wider than high; surface of occipital with very obscure swellings between foramen magnum and lambdoid ridge ; par- occipital processes very slender ; basioccipital rather narrow and long, its width
. Catalogue of the mammals of Western Europe (Europe exclusive of Russia) in the collection of the British museum. Mammals. SCIUROPTERUS 943 less of the surface of parietal is visible ; occiput very low, its height above lower lip of foramen magnum about one-half mastoid breadth, its dorsal and lateral margins forming a flattened curve much less than a semicircle in extent ; foramen magnum decidedly wider than high; surface of occipital with very obscure swellings between foramen magnum and lambdoid ridge ; par- occipital processes very slender ; basioccipital rather narrow and long, its width anteriorly about one-half median length, its lateral ridges obsolete, not tending to form processes as in Sciurus vulgaris and Citellus; auditory bullae sub-circular in general outline, their form essentially as in Sciurus vulgaris, but their. Fig. 19;'). Sciuropterus russicun. Nat. size. size actually as well as relatively greater, the antero-posterior diameter equal to distance from front of bulla to front of j^i, the lateral diameter to outer margin of meatus fully 1^ times least width of basioccipital; anterior upper margin of meatus developed into a conspicuous forward-curved flange ; jjetrosal tending to be exposed in region above meatus instead of on occipital surface. Interorbital region decidedly longer than broad, its surface noticeably concave laterally, so that bases of ])ostorbital processes are evidently above level of median region ; notch at anterior base of postorbital process large, always open; postorbital processes long and slender, strongly curved downward, the orbit. 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 British Museum (Natural History). Dept. of Zoology; Miller, Gerrit S. (Gerrit Smith), 1869-1956. London, Printed by order of the Trustees
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmammals, bookyear1912
