242 TRANSACTIONS OF THE [may 15, 
long gleno-radial head, roofing in the bicipital canal and merg- 
ing with the deep surface of the tendon of the Pectoralis major, 
or, in some instances, extending beyond the pectoral tendon to 
the deep fascia of the arm. 
This is the most common form in which the variation presents 
itself. 
Cases : 
1. 9, white, U. 8., aet. 62. January 30, 1894. 
Plate XVII. Right upper extremity : 
A distinct tendon, imbedded in the capsule of the joint, over- 
lying the intertubercular groove, covering the long bicipital 
tendon and passing to the deep surface of the Pectoralis major 
tendon, on which it spreads out in the upper third, terminating 
‘by interlacing with the pectoral tendon fibres. 
Left upper extremity : 
Presents the same slip, more strongly developed, extending 
nearly to the lower border of the Pectoralis major tendon. 
Plate XVIII. Capsule between the tuberosities partly divided, 
‘to show the deep position of the tendon imbedded in the shoulder 
‘capsule, and indicating a tendency toward intra-articular immi- 
gration. 
Plate XIX. The same joint opened from behind, with head of 
humerus removed. The thickened strand on the inner surface of 
the anterior wall of the capsule, just in front of the long Biceps 
tendon, is directly continuous with the fibres of the tendon slip. 
2. $, Austria, aet. 65. October 11, 1893. 
Plate XX. Right upper extremity. 
Strong fibrous band arising from capsule over lesser tuber- 
osity, and descending over long tendon of Biceps, connected 
with deep surface of Pectoralis major tendon, to the lower mar- 
gin of which it extends. 
A tendon band from anterior part of capsule passes to outer mar- 
_gin of short head, indicating tendency to subdivision of this head. 
.3. 9. Germany, aet. 84. November 9, 1893. 
Plate XXI. Right upper extremity. 
‘Well marked strong fibrous fasciculus, extending from cap- 
sule of shoulder joint over the bicipital groove and contents to 
the deep surface of the Pectoralis major tendon. Some fibres 
merge with the pectoral tendon, while others continue. below its 
inferior margin to join the deep fascia of the arm. 
The left upper extremity of the same subject presents a 
transition to the form next to be described (Gleno-ulnar muscle). 
A strong tendinous band, incorporated at its origin in the cap- 
sule of the shoulder joint, passes downward, covering in the bi- 
cipital groove and attaching itself to the upper margin and deep 
