xi v.l INSECTIVORA. 251 



cartilage (the mesoscapular segment, Parker, tnss), which 

 ossifies by extension of bone from the rest of the clavicle. 

 It is connected with the acromion by a small oval, flat, 

 synovial articulation. The inner end (pt) is also cartila- 

 ginous for some time, but ossifies separately by endostosis, 

 forming an epiphysis. This extremity is attached to the 

 presternum by synovial articulation, but with a disk-like 

 fibro- cartilage (ost) interposed, which, according to Parker, 

 is a degeneration of the " omosternal " element. 



In the Gorilla the scapula is very like that of Man. In 

 the Chimpanzee it is peculiarly elongated, the suprascapular 

 margin being extremely oblique and long, at the expense 

 of the greatly reduced coracoid border. The acromion and 

 coracoid are largely developed. In the lower Monkeys the 

 form of the scapula is quite different, the coracoid and 

 glenoid borders being nearly equal, and the suprascapular 

 border comparatively short and straight. 



The clavicle is well developed in all the Primates, 

 and all its correlates are present ; the omosternum being 

 generally converted during growth into a fibro-cartilaginous 

 intra-articular disk. 



In the various members of the Order INSECTIVORA there 

 is a great difference in the construction of the shoulder 

 girdle. 



In the Mole (Talpa) and its immediate allies, Sea lops and 

 Condylura, the scapula is extremely high and narrow, and 

 appears to be ossified entirely from one centre. The spine 

 and acromion are very little developed. The bone com- 

 monly called clavicle, but which may be a combination of 

 coracoid and clavicle, is of remarkable form, being nearly 

 cuboid. It is formed primitively of a mass of cartilage, on 

 the anterior aspect of which the true (membrane-developed) 

 clavicle is engrafted. It articulates inferiorly with the pre- 



