. Bulletin - United States National Museum. Science. MAMMALS OF TIIK MEXICAN BOUNDARY. 447 grayish hairs on inner surface, with their convex surface Mack ante- riorly and hull' posteriorly; tail brownish black, somewhat lighter below3 the hairs almost concealing the annuli. Cranial characters.—The skull (fig. 110), compared with skulls of Sigmodon hispidus and its races, is short and high,with the rostral portion shortened and the nasals more contracted apically. Corre- lated with the greater height of the brain ease is the much deeper temporal fossa, which is divided by an approximately media
. Bulletin - United States National Museum. Science. MAMMALS OF TIIK MEXICAN BOUNDARY. 447 grayish hairs on inner surface, with their convex surface Mack ante- riorly and hull' posteriorly; tail brownish black, somewhat lighter below3 the hairs almost concealing the annuli. Cranial characters.—The skull (fig. 110), compared with skulls of Sigmodon hispidus and its races, is short and high,with the rostral portion shortened and the nasals more contracted apically. Corre- lated with the greater height of the brain ease is the much deeper temporal fossa, which is divided by an approximately median lon- gitudinal osseous ridge into two nearly equal areas, the lower giving rise to that portion of the temporalis muscle which is inserted into the outer surface and posterior margin of the coronoid process of the mandible, the upper to that which is inserted in the anterior border and inner surface of the coronoid. In Sigmodon minimus these two parts of (lie temporalis muscle are of approximately equal size, while in S. /iis/>i<h<8 the two are very unequal, the lower being much smaller than the 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
