258 THE SHOULDER GIRDLE. [CHAP 



but is quite absent in the Giraffe, which has the longest and 

 narrowest scapula of the group. 



In the Horse the scapula is long and slender, the supra- 

 scapular border is rounded, and slowly and imperfectly 

 ossified. The spine is very slightly developed ; rather above 

 the middle its edge is thickened and somewhat turned back- 

 wards ; it gradually subsides at the lower extremity without 

 forming any acromial process. The coracoid is a prominent 

 rounded nodule. 



In the other Perissodactyles, and in the Pigs and Peccaries, 

 there is a strongly-marked retroverted triangular process 

 on the middle of the edge of the spine, and no true 

 acromion ; but in the Hippopotamus there is a small 

 acromion and no distinct mid-spinous process. In this 

 animal the coracoid is rather long and upturned. 



In the Tapir the coraco-scapular notch is remarkably 

 deep. 



The Hyrax manifests its affinity with the Ungulata in the 

 form of the scapula, which is generally triangular, with a 

 small spine, most prominent and with a retroverted edge 

 near the middle, and gradually subsiding at each extremity? 

 so that there is no trace of an acromial process. 



The Elephant has a largely-developed postscapular fossa 

 and a narrow anterior fossa. The glenoid border is short, 

 and forms a very prominent angle posteriorly with the 

 unusually long suprascapular border. The spine is promi- 

 nent, and has a very strongly-marked process projecting 

 backwards from near the middle and a moderate-sized 

 acromion. The coracoid is small and rounded. 



The EDENTATA present some very interesting conditions 

 of the shoulder girdle. 



In the Cape Anteater (Orycteropus) the scapula is of 

 the most normal form, with well-developed acromion and 



