Vol. xiv.j Leach, The Myolosy of the Bell-Magpie. I3 



55. The coraco-hitmeralis. 



56. The scapiilo-humeralis. 



57. The sufraspinattis. 



58. The teres et infraspinatus. 



59. The serratus magnus anticiis. 



60. The stibclavitis. 



61. The coraco-brachialis. 



62. The teres minor. 



63. The levator scapiilcs. 



64. The thoraco-scapularis. 



65. The subscapular is. 



66. The serratus parvus anticus. 



52. The latissimus dorsi [22] is a superficial muscle. It is not 

 so well developed in Strepera, Gymnorhina, and Cracticus as in 

 the Australian Raven. Shufeldt found in the American Raven 

 it consisted of two distinct slips, and figures it as extending back 

 in the mid-line as far at least as the line joining the posterior end 

 of the scapula. The Australian Raven agrees with this. Strepera, 

 Gymnorhina, and Cracticus, on the other hand, have a much 

 smaller and narrower muscle, corresponding to the anterior slip 

 of the muscle in the Raven. It arises as a thin fascia from the 

 neural spines of the first and second vertebrse that bear full ribs. 

 The fibres converge, pass under the deltoid muscle and the 

 scapula head of the triceps muscle to the humerus, to be inserted 

 on the shaft behind the insertion of the pectoralis major (49). 



53. The trapezins [22] is much longer in Strepera. It is visible 

 both before and behind the latissimus dorsi (52), and not before 

 only, as in the Raven. It passes from the vertebrae to the scapula. 

 Posteriorly, it overlies part of the rhomboideus (54). Gymnorhina 

 and Cracticus agree with Strepera. 



54. The rhomboideus [22] arises from the neural spines of the 

 first four dorsal vertebrae, and runs obliquely outwards to the 

 scapula, as described by Shufeldt. 



55. The coraco-humeralis [22a], a small muscle, arises, as 

 Shufeldt found in the Raven, from the outer side of the head of 

 the coracoid, near the origin of the biceps. In Strepera it is fleshy, 

 and runs across to be inserted on the palmar aspect of the humerus, 

 anterior to the insertion of the pectoralis major (49). 



56. The scapulo-hiimeralis [22a'] runs from the neck of the 

 scapula as a narrow, cord-like muscle, to be inserted between the 

 insertion of the pectoralis secundus (56) and the pectoralis major (49). 



57. The supraspinatus [22a] [23a] is a flat muscle arising from 

 the scapula and passing directly across to be inserted in the 

 pneumatic fossa of the humerus between the internal and external 

 heads of the triceps. The joint tendon of the teres minor (62) and 

 coraco-brachialis {61) is inserted just posterior to this muscle. 



58. The teres et infraspinatus [22a] [23^] is a large, flat, triangular 

 muscle arising from the whole length of the scapula behind the 



