THE MUSCLES OF THE UPPER EXTREMITY. 87 



inner side of the neck of the scapula just within the 

 origin of the deltoid ; its fibres form a narrow, flat- 

 tened ribbon, that passes over the top of the shoulder- 

 joint, parallel to the upper margin of the larger portion 

 of the deltoid, to become inserted on the palmar aspect 

 of the humeral head, directly between the insertions 

 of the pectoralis major and secundus (Fig. 33, s.A.). 



Professor Owen describes for the Apteryx a sub- 

 scapularis muscle as arising "from the anterior part 

 of the inner surface of the scapula, and is inserted 

 into the ulnar humeral tuberosity." I might have 

 considered this the same as the muscle described 

 above as my scapulo-humerahs, but the eminent 

 anatomist just quoted says further that the sub- 

 scapularis is divided into two portions by the pec- 

 toralis minor. 



Unfortunately, I have not Professor Owen's drawings 

 of the myology of Apteryx before me at the present 

 writing, but it is difficult for me to understand from 

 his description in The Anatomy of Vertebrates, how 

 the muscle he calls the subscapularis can be " divided 

 into two portions by the pectoralis minor," when he 

 says of the latter that " A muscle, which may be 

 regarded either as a portion of the pectoralis minor, 

 or as the analogue of the subclavius muscle, arises 

 from the anterior angle of the sternum, and is in- 

 serted into the external margin of the sternal extremity 



Deltoideus minor. Fiirbringer ; Carlsson, p. 20. 

 Accessoire coracoidien du sus-sjnneux. Alix, p. 399 (?)." 



Considerable confusion has attended the identification of this 

 muscle, and the deltoideus minor of Selenka (Bronn's Klassen, 

 vi. Band, p. 117) is not ta.ken by Gadovv to be the muscle he 

 describes under that name, and the present writer is satisfied that 

 the d. minor of Gadow is the muscle described above as the 

 scctpulo humeralis. 



