64 THE SKELETON OF THE CAT. 
midway between the tip of the acromion and the vertebral end 
of the spine. The spine is inclined toward the glenoid margin 
so as to form an angle of about 60 degrees with the caudal half 
of the lateral surface. 
At the base of the acromion process (7) the margin of the 
spine presents a flat triangular projection, the metacromion (;), 
directed toward the glenoid border. 
The acromion (7) continues in the direction of the spine. 
It is thicker than the spine, smooth and rounded on both its 
surfaces and both its borders, and its apex is connected by 
fibrous tissue to the clavicle. 
The coracoid border (4) presents a slight rounded notch, 
the incisura scapule or suprascapular notch (Z), just dorsad of 
the glenoid angle, and at its ventral end bears the coracoid 
process (7) which is directed ventromediad. 
The glenoid angle (d) is the only one requiring special 
mention. Between the root of the coracoid process and 
the glenoid cavity it presents a tubercle, the supraglenoidal 
or bicipital tubercle (£), for the tendon of origin of the biceps 
muscle. The glenoid angle is separated by a contracted neck. 
from the rest of the bone. Between this angle and the inner 
margin of the acromion there is left a deep notch, the great 
scapular notch. 
Clavicle. Clavicula (Fig. 46).—The clavicle in the cat is 
greatly reduced. It is a slender curved rod 
be a of bone imbedded in the muscles of the 
Fic. 46.—Cravicre. Shoulder and connected by fibrous tissue to 
a, medial end; 4, lat- the apex of the acromion process. The 
eral enh lateral end (0) is slightly enlarged. 
Humerus (Figs.. 47 and 48).—The humerus forms the sup- 
port of the upper arm and articulates by its proximal end with 
the scapula at the glenoid cavity, and by its distal end with the 
radius and ulna, the bones of the lower arm. It is a nearly 
cylindrical bone with enlarged ends, and is so curved that its 
dorsal and ventral borders are hooked at the opposite ends so 
that it has the form of an Italic f. 
The proximal end of the bone bears on its dorsomedial 
portion a thickening, the head of the humerus (a), which bears 
