244 TRANSACTIONS OF THE [May 13, 
with the deep surface of the Pectoralis major tendon. Becoming 
muscular a short distance beyond the lower border of the Pec- 
toralis tendon the slip passes obliquely inwards across the long 
head, fusing with its anterior surface and inner margin, or 
joining the outer margin of the short coracoid head. 
Cases : 
1. ¢, U.S., white, aet. 24. November 29, 1893. 
Plate XXII. Right side. 
A strong shining tendinous band arises from the glenoid 
margin incorporated with the shoulder capsule. Passing down 
and emerging from beneath the edge of the coraco-acromial 
ligament, the tendon becomes closely connected with the deep 
surface of the Pectoralis major tendon, interlacing with its fibres 
at right angles, lying upon the long tendon of the Biceps and 
forming the main portion of the roof of the inter-tubercular 
groove. Toward the lower portion of the pectoral tendon the 
inner half of the slip gradually separates itself from the same 
and forms a small muscular belly which joins the outer margin 
of the short biciptal head near its junction with the long head. 
The outer portion of the tendon slip gradually passes deeper 
into the substance of the Pectoralis tendon, with which it is in- 
tricately interlaced. On the bottom of the inter-tubercular 
groove are several well marked longitudional tendinous bands, 
connected below with the tendon of the Pectoralis major ; above 
they in part separate from the tendon, passing upward and in- 
ward and crossing at. right angles the tendon fibres of Latissimus 
dorsi and Teres major; in part they go upward and outward, ly- 
ing in the floor of the bicipital groove under cover of the long 
Biceps tendon. 
A small third internal humeral head of the Biceps is present: 
in the same arm, derived from the Coraco-brachialis insertion. 
2. ¢,U.8., white, aet. 50. 
Plate XXIII. Right upper extremity. 
Tendon slip with intermediate attachment to deep surface of 
Pectoralis major tendon, arising in connection with capsular 
ligament from the glenoid margin, and passing to the inner bor- 
der of the long bicipital head, at the line of junction with the 
short head. 
3. &%, Ireland, aet. 32. November 29, 1893. 
‘Plate XXVIII. Left upper extremity of subject, whose right 
upper extremity presents the variation described under ‘ b 2,’” 
Plate XX VII. vidi ibid. 
4. $,U.S., negro, aet. 50. December 14, 1893. 
Plate XXIV. Right side. 
Tendon in part fused with deep surface of Pectoralis major 
