. Monographs of North American rodentia [microform]. Rodentia; Paleontology; Rongeurs; Paléontologie. \" j'%1 \r 578 MONOORAPlia OF NORTH AMERICAN KODENTIA. and knobbed at the sternal extremity, where the cross-section would be decidedly triangular. The scapula is about inches long by broad at the widest part, and presents numerous well-marked features. The general contour is that of an inequilateral triangle with the postero-superior corner rounded off, and the anterior angle pro(?uced into a neck. The lower border, which is much the longest, is nearly straight; the jwsterior c
. Monographs of North American rodentia [microform]. Rodentia; Paleontology; Rongeurs; Paléontologie. \" j'%1 \r 578 MONOORAPlia OF NORTH AMERICAN KODENTIA. and knobbed at the sternal extremity, where the cross-section would be decidedly triangular. The scapula is about inches long by broad at the widest part, and presents numerous well-marked features. The general contour is that of an inequilateral triangle with the postero-superior corner rounded off, and the anterior angle pro(?uced into a neck. The lower border, which is much the longest, is nearly straight; the jwsterior curves gently upward and forward, and is as long as the superior, which, at first convex, then curves with con- cave outline to the superior border of the glenoid. The ventral surface is uneven, being marked by a median line of impression, indicating the root of the spine on the opposite face, and by two radiating ridges on either side of the median line; while there are also two other ridges, one running the whole length of the superior border, the other marking a small part of the inferior border near the postero-inferior angle. Thus the l)ed of the subscapularis muscle is divided by these four ridges into three compartments. The dorsum of the blade is quite smooth and nearly flat; the very prominent spine, run- ning the whole length of the bone, divides this surface into an upper, broader but shorter, and an under, longer but narrow, portion for the supraspinatus and infraspinatus muscles respectively. The plate of the spine is perpendic- ular to the body of the bone; its free edge is strongly convex throughout, the height of the spine at its middle being nearly as great as at its acromial end, and somewhat sinuous from deflection of the plane of the spine out of the perpendicular; tlie greatest height is about , or more than half the greatest width of the bone. At its fore end, the spine develops a well marked prominent acromial process, reaching forward and upward, th
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Keywords: ., bookcentury1800, bookdecade1870, bookpub, booksubjectpaleontology
