476 



bone to which the supraspioatus, infraspinatus, subscapularis, teres 

 minor, and part of the deep pectoral muscles are attached. The distal 

 end of the bone is completely ossified, showing no indication whatever 

 of an epiphysis. 



Radius. In lion No. 1 the extent of the proximal epiphysis is 

 indicated by a moderately distinct line. It includes the articular sur- 

 faces for the humerus and the lesser sigmoid cavity of the ulna, and 

 nothing more. In the older animal it has completely blended with the 

 shaft. In neither animal is there the slightest appearance of an epi- 

 physis in association with the tubercle for the insertion of the biceps 

 muscle: a centre said to come into being in the domestic cat soon 

 after birth (Jayne). 



The distal epiphysis in both animals can be easily removed. It 

 includes the grooves for the extensor muscles, and the articular sur- 

 face for the ulna (Fig. 5). Mesially it forms a projection by means 

 of which the groove for the extensor ossis metacarpi pollicis muscle 

 is completed. 



Ulna. In the younger lion the epiphysis on the summit of the 

 olecranon is free (Fig. 6): in the older animal it cannot be removed, 



ol.pr. 



l.s.c. •■ 



M'.e.cr. M-e-«-'^- 



st.pr. 



head. 



6. 



Fig. 5. Fig. 



5. Distal end of left ladius. Anterior aspect. 



st.])r. 

 Fig. 7. 



Fig. 5. Distal end of left radius. Anterior aspect, st.pr. styloid process, ßl.e.c.r. 

 groove for extensor carpi radialis. M.e.c.d. groove for extensor communis digitorum. 

 M.e.i. groove for extensor indicis. 



Fig. 6. Proximal end of left ulna. Radial side. ol.2^r. olecranon process, g.s.c. 

 greater sigmoid cavity, l.s.c. lesser sigmoid cavity. 



Fig. 7. Distal end of left ulna, st.pr. styloid process. 



