26 Proceedings of tlte Royal Irish Academy. 



lower ribs : beneath it was a large bursa and also a mass of firm 

 white fat, weighing about 2 oz. The tendon of insertion was scarcely 

 at all twisted on itself, as in man : insertion as nsnal. 



The triceps accessorius ('05), triangular in shape, about one inch 

 broad and long, and very thin, was inserted by a long fine tendon intO' 

 the inner and posterior surface of the olecranon. Supplied by the- 

 musculo-spiral nerve. 



Subscapularis (4"90), very thick. Pectoralis minor absent. 

 Pectoralis major (16'86) consisted of two layers, embracing be- 

 tween their insertions the triceps. The superficial layer arose from 

 the median line of the thorax ; closely connected with the opposite 

 muscle. Insertion into a ridge on the outer surface of the humerus for 

 about eight inches ; also into the greater tuberosity, continuous below 

 with the clavicular portion of the deltoid. 



The deep, the smaller of the two, arose from the sternum, nearer its. 

 lateral margin, and was inserted into the lesser tuberosity, and a line 

 leading downwards and forwards from it for about three inches. 

 Coraco-brachialis major, and subclavius, were absent. 

 The coraco-brachialis minor ("06) arose by a fine tendon from the 

 upper border of the glenoid cavity. It soon became fleshy, and was 

 inserted tendinous and fleshy, immediately below the facet for the 

 subscapularis tendon, which it crossed over, on the lesser tuberosity. 

 The above was symmetrical. 



The deltoid, as usual, divisible into three portions — scapularis, 

 acromialis, and clavicularis, though the division was more or less arti- 

 ficial in some places. 



Scapularis, from spine of scapula to crest on humerus, = r60. 

 Acromialis (1"00), from acromion process, and where it should 

 have arisen from the clavicle, was more or less fused with the clavicu- 

 laris (1*85), which also arose from the acromion. The two latter- 

 became continuous with the triceps, about an inch from its insertion, 

 there being no traceable connexion with the radiiis. A floating cla- 

 vicle was developed in the substance of the clavicularis. 



Supra- and inf ra-spinati as usual ; tendon of insertion of former was 

 fibro-eartilaginous. Eespectivc weights 7'36 and 5*65. 



Serratus magnus arose from upper ten ribs and formed one mass, 

 not divisible into the three usual portions. Insertion was normal, 

 but rather larger than usual, = 8'62. 



The spino-glenoid ligament consisted of two layers with fat between, 

 attached posteriorly to the under surface of the acromion, internally 

 and posteriorly to base of acromion, and anteriorly to the edge of the 

 glenoid cavity, forming an arch corresponding to the neck of the sca- 

 pula, beneath wiiich passed the supra-scapular nerve. 



The biceps humeri (3-80) had only one head of origin from the- 

 scapula, immediately above the glenoid cavity, Avhich pierced the cap- 

 sular ligament, and united, at its insertion into the radius, with part 

 of the tendon of the brachia3us. 



The brachiasus ('62) arose from the greater part of the anterior 



