1867.] Mr. J. Wood on Variations in Human Myology. 523 



process of the atlas. In third (No. 27) the Scalenus anticus received 

 a large slip across the subclavian artery from the medius. In No. 30 

 the Levator anguli scapulce sent a large slip of its fibres to join the inser- 

 tion of the scalenus medius. 



rig. 3, 



These interchanges have been frequently observed in these muscles. 

 In No. 32 was a well-marked specimen of the muscle named by the 

 author in his previous papers the Sujpra-costal. It was attached below 

 to the third rib in front of the serratus magnus, and above to the first 

 rib and cervical fascia. In No. 33 it was a very distinct duplication of 

 the Bectus capitis posticus major, like that described by Albinus and San- 

 difort, and by Douglas both in Man and the Dog. 



Twenty-one columns of the accompanying Table are occupied by the 

 muscles of the upper extremity only. Twenty-six muscles are concerned. 

 The instances number 158, viz. 117 in the 22 males, and 41 in the 12 

 females. 



4. Pectoralis major. — The number and kind of abnormalities of this 

 muscle, as well as of the pectoralis minor, coincide almost exactly with 

 those of last year in nearly an equal number of subjects. In one (No. 5) 

 was a detached slip arising separately from the abdominal aponeurosis 

 opposite the seventh costal cartilage, and crossing the axilla to be in- 

 serted into the tendon of, and fascia covering, the coraco-lracliialis about 

 an inch below the coracoid process. In another (No. 6) a similar slip 

 arose from the fifth rib connected with the lower fibres of the pectoralis 

 major, and was inserted with the pectoralis minor into the coracoid pro- 

 cess joining on to the coraco-brachialis. In No. 20 a separate slip arose 

 from the abdominal aponeurosis at some distance from the rest of the 

 muscle, and was inserted into the deep surface of its tendon at the upper 



