140 PROCEEDINGS <)F THE ANA TOM K 'AL AM) ANTII KOl'OLOGICAL 



Pectoraiis major. 



There is no cellular interval between the clavicular and sternal 

 portions. The anterior surface of the tendon is muscular, containing 

 the fibres from the clavicle. The under portion of the tendon con- 

 taining the fibres from the ribs, etc., is tendinous. Its insertion mingled 

 with that of the deltoid. 



Pectoraiis minor. 



Arose from three ribs close to the costo-chondral junction. The 

 tendon was long and thin and passed above the coracoid under the 

 coraco-acromial ligament to be inserted along with the supraspinatus 

 into the capsule of the shoulder joint. This behaviour of the peetoralis 

 minor tendon is exceedingly interesting and is noted by most of the 

 observers. In man also it has been seen to send a slip to the great 

 tuberosity of the humerus. Its disposition in this chimpanzee corre- 

 sponded exactly to that found in a female human subject by Messrs. 

 Martin and Gerrard and described by them to the society in February, 

 1904. 



Subclavius. 

 As in man. 



Deltoid. 



The fibres of origin from the clavicle passed directly above into 

 those of the cleido-occipitalis. At its insertion it mingled with the 

 peetoralis major. A pennate arrangement of the fibres from the 

 acromion was not observed. 



Supraspinatus. 

 Very small muscle in comparison with the infraspinatus. 



Infraspinatus. 

 As in man. 



Teres minor. 



Was attached to the upper two-thirds of the axillary border of 

 scapula as in man. Champneys found it arising only from the middle 

 third. 



