106 



MASTODON AND ELEPHANT. 



The great tuberosity terminates anteriorly in a large rough tubercle. 

 The rough ridge for the insertion of the biceps muscle, the articular surface 

 of the head of the bone, the groove of the biceps muscle, the condyles 

 external and internal, their articulating surfaces, and other prominences 

 and depressions of the bone, agree with those of the large skeleton, with 

 the exception that the semi-lunar notch is deeper in proportion to its 

 width. 



ELBOW. 



The elbow-joint exhibits two articulating surfaces belonging to the 

 condyles, and three belonging to the bones of the fore-arm. The two first 

 are prominent, semicircular ; and of the three latter the internal is formed 

 by the ulna in a great measure, and so is the external : the radius con- 

 tributes to both of the surfaces, mostly to the external. The third inferior 

 articulating surface, formed by the anterior superior part of the olecranon 

 process, is divided into two surfaces corresponding with the opposite 

 condyles by a middle ridge. 



ULNA. 



Length of the ulna . . . . 



Circumference of the superior extremity, including the olecranon process 



Circumference of the middle of the shaft 



Circumference of the lower extremity .... 



Length of the olecranon process superiorly 



Greatest circumference of the olecranon process 



Transverse dimensions of the superior articulating surface 



Antero-posterior measurement of the superior articulating surface . 



Articulating surface of the olecranon process, from above downwards 



Inferior articulating surface 



Antero-posterior articulating surface 



HASTODON. 

 Inches. 



27 

 31 



101 



18 



7 



29J 

 71 



"4 



31 



41 

 ^4 



ELEPHAXT. 

 Inches. 



SI 



65 



HI 



20 



6 



19| 



8i 

 3^ 



