349 Kneeland on the Skeleton of the Great Chimpanzée. 
than either, in its more equilateral form. "The spine is placed 
nearly in the middle of the bone, making the supra spinous 
nearly equal to the infra spinous fossa; after about one third 
of its length it ceases to have the broad thick edge of the 
human spine, reaching nearly to the posterior border, but is 
continued by a sharp well-marked ridge quite to the edge, as 
in the Orang; the spine is also more perpendicular to the 
plane of the dorsum than in man, and its direction more that 
of the axis of the trunk. The acromion process is longer, 
and less curved than in man, and wants the strong angle on 
its posterior surface a little in advance of the plane of the 
glenoid cavity ; its arch over this cavity belongs also to a 
much larger circle. The coracoid process has a greater in- 
clination downwards than in man and the Chimpanzée ; this 
direction, in the Orang, Vrolik considers a sign of inferiority. 
The glenoid cavity is much the same as in man, the upper 
half being less narrow in proportion. The subscapular fossa 
is very deep, and divided by prominent ridges into five or six 
smaller depressions. There is no deep supra-scapular notch 
as in the human scapula; but there is a decided concavity at 
the base of the coracoid process, without the narrowness of a 
notch, contrasting strongly with the nearly straight line of the 
upper border of the bone in the Orang. 
The clavicles are shorter and stronger than in man, and 
less curved ; the edges are more angular; their length, in a 
straight line, is six and one fourth inches ; their circumference 
in the middle two inches, thence increasing to each end ; the 
subclavian ridge is well marked. 
The sternum, at its upper portion, is four inches wide, and 
about half an inch thick; there is a decided semilunar notch, 
but less than in man ; the lower portions are wanting. There 
is no sign of division into lateral halves in this upper portion, 
which is three and three fourths inches long. The articular 
surface for the clavicles is less curved and more horizontal 
than in man. 
The ribs are fourteen pairs; of these two are wanting on 
