200 APPENDIX. 



Tldrd Sternebra. — This closely resembles the second, except in having a more blunt 

 superior margin, and the inferior not so distinctly keeled. Its dimensions are — 



Inches. 



In length 3.9 



In width 2.7 



Depth at the anterior margin 1.9 



the fourth and fifth sternebra are in such a state of decay, that their true figures cannot be 

 with certainty defined. 



ANTERIOR EXTREMITIES. 



Scapula. — A magnificent portion of the right remains, — 



In length 12.6 



In width below the crest 8.3 



The antero-posterior diameter of the glenoid cavity measures about ...... 7.5 



The transverse diameter of the glenoid cavity measures about . . ... . . . 3.9 



The acromion process only of the left is preserved, in length 11.4, and in width at the base 

 about 5.9 ; dimensions which, taken in connection with others of the right scapula, show the 

 uncommon size of these bones in the Mastodon. 



Humerus. — These bones display the same extraordinary proportions. The right humerus 

 is as fresh as if from a recent animal. It measures from the top of the external tuberosity to 

 the condyle, 31.5 ; antero-posterior extension of the external tuberosity, 9.4 ; transverse width at 

 the origin of the condyloid crest, 10.2 ; elevation of the external tuberosity above the articulating 

 head, 1.6. 



The left humerus wants the lower extremity, with the exception of the anterior portion of 

 the internal condyle. 



Ulna. — The fore-arm constitutes a bony mass, about 3.5 shorter than the humerus. In 

 very good condition are both the ulnae, the entire left radius, and a portion of the right. The 

 inferior articulation with the radius, 1.9. From the point of the olecranon to the margin of the 

 inferior articulating surface of the ulna, 27.5. 



Radius. — 



Articulating face at lower extremity for ulna, in diameter 1.9 



Left radio-carpal surface .............. 24.4 



Length of the right fragment 9-4 



Carpus. — But few of the bones of the carpus remain uninjured ; of these are the Pyramidale 

 and Os Magnum, of each side. 



