64 



sole slightly turned inwards. A tail equalling the hind limbs in length, 

 and proportionally as thick and strong, assists in supporting the broad 

 pelvis. 



The sacrum is lengthened by the anchylosis of the lumbar vertebrae. 



A long and capacious thorax is defended by sixteen pairs of ribs, 

 most of which equal in breadth those of the Elephant, and all the true 

 ribs are clamped by massive and completely ossified cartilages to a strong 

 and complicated sternum. 



The scapulae, distinguished by their unusual breadth, and by the osseous 

 arch connecting the acromial and coracoid processes, are attached to the 

 large manubrium sterni by strong and complete clavicles. 



The humeri, short and thick, like the femora, have their muscular 

 processes, ridges and condyles still more strongly developed ; but the ro- 

 tatory and lateral movements are not obstructed by any inordinate pro- 

 duction of the proximal tuberosities. 



The fore-arm is longer than its corresponding segment in the hind 

 limb, has both bones distinct, and equally remarkable for their great 

 breadth and the angular form, occasioned by the prominence of the in- 

 termuscular ridges : yet the mechanism for free pronation and supination 

 is complete. 



The fore-foot is pentadactyle, and of great breadth and strength ; but 

 so unusually massive are the proportions of the radius and ulna, that it 

 appears relatively small ; and notwithstanding certain fingers are termi- 

 minated by claw-bones of great size and length, yet, owing to the form of 

 their proximal phalanges and metacarpal bones, it is short in proportion 

 to its breadth. 



The hind-foot is tetradactyle, with the two inner toes elongated and 

 armed with unequal but large claws. 



Both the fore and hind feet are remarkable for the shortness, breadth 

 and ungulate character of the two outer digits, which, when the Mylodon 

 stood or trod upon the ground, must have principally sustained the 

 superincumbent weight. 



A skull smaller than that of the Ox, but long, narrow, and terminated 



