THORAX AND RIBS. 33 



it does not arise from the glenoid cavity, but is rather a division of the 

 great spine of the scapula, which may be said to bifurcate at its inferior 

 extremity; forming an anterior division, the acromion process; and a pos- 

 terior, longer, rougher, and curved, thence called the curved process. 



The supra or anterior spinous fossa is small, the posterior very ample : 

 the former measures only six inches at its widest part ; the latter, twenty- 

 two. The first is a little excavated on its outer face ; the latter, generally 

 convex, but with a concavity near the spine. 



The internal face or hollow of the scapula is subdivided into two 

 unequal faces by an eminence corresponding with the spine of the scapula. 

 It is smooth inferiorly, very rough superiorly, and terminates in the very 

 rough thick superior angle.* The anterior division corresponds very nearly 

 with the anterior spinal fossa ; the posterior division is the real hollow of 

 the scapula ; it occupies the posterior two-thirds of the bone ; the anterior 

 is not excavated, and is very rough for muscular attachments. The anterior 

 edge of the scapula is generally thin, except at its junction with the neck 

 of the bone, where it becomes very thick, terminating in the superior edge of 

 the glenoid cavity. 



The glenoid cavity is regularly excavated, of an elongated oval form, 

 and looks downwards. Its articular surface is eleven inches long, and five 

 wide. Its circumference is not particularly rough, except near the external 

 edge. 



The posterior inferior edge of the scapula is thick near the articulation ; 

 then becomes thin; and afterwards thickens in the posterior angle, which 

 is very thick, but not so much so as the anterior superior angle. 



* It is stated by authors, that this eminence does not exist in the subscapular face of the Asiatic 

 Elephant ; but in our specimen it is very remarkable, as it is also in the Mastodon. 



