164 DR. R. W. SHUFELDT ON [Apr. 1, 



pectoralis II. of Stannius, and the epieoraco-humeral of Mivart. 

 Fiirbringer also called it the siipracoracoidevs. As in Liolepis, the 

 supraspinatus is covered by the deltoideus at least for its inner 

 anterior part and anterior border. Mr. Sanders, who says that he 

 has " seen Prof. Rolleston's paper (Trans. Linn. Soc. vol. xxvi. 

 pt. 3), ' On the Homologies of certain Muscles connected with the 

 Shoulder-joint,' in which he goes far to prove that the ' epicoraco- 

 humeralis ' (which was Dr. Mivart's name for the supraspinatus) 

 corresponds to the snbclavius ; but these differences of interpretation 

 are reconciled by Mr. Galton's paper ' On the Myology of the 

 Orycteropus capensis,' in the same volume, in which the author 

 shows that the subclavius in that animal has, among otber inser- 

 tions, one into the fascia covering the supraspinatus. Another piece 

 of evidence bears upon this point ; I believe that the nerve which in 

 anthropotomy supplies the supraspinatus, arises from the same cord 

 of the brachial plexus and close to the same one which supplies the 

 subclavius, so that the muscle in question really corresponds to the 

 subclavius at its origin, and to the supraspinatus at its insertion " 

 (P. Z. S. 1872). 



22. The Infraspinatus in Helodertna is a broad, thin, and fan-shaped 

 muscle which arises from a curved line occupying a middle position 

 upon the external surface of the suprascapula. From this point of 

 origin its fibres tend immediately to converge to a point, but terminate 

 in a strong, flat tendon which inserts itself upon the tuberosity of the 

 humerus just beyond the insertions of the deltoideus and supraspi- 

 natus. 



23. The Teres minor is one of the deeper muscles of this shoulder- 

 girdle group, and it arises from the antero-external border of the 

 coracoid and the adjacent margin of the scapula. Its fibres pass 

 upwards, backwards, and outwards, when, becoming tendinous, the 

 muscle inserts itself upon the proximal end of the humerus of the 

 same side, just beyond its head. Not far from its insertion, the 

 teres minor is bound down by a strong tendinous aponeurosis, which 

 latter comes off from the tendon of the long head of the triceps, 

 connecting this last with the head of the humerus. Fiirbringer 

 called this muscle the scapulo-humeralis profundus, in which he was 

 followed by Hoffmann ; and according to this latter author it repre- 

 sents the supraspinatus of Pfeiffer and Riidinger, the infraspinatus 

 of Mivart, the svprascapuloris of RoUeston, and the teres minor of 

 Sanders : may we not in truth believe that there is still work to be 

 done in the myology of reptiles ? 



24. Serratus superficialis. — Two of the serrati muscles form an 

 oblong fleshy mass upon the external aspect of the thoracic parietes, 

 connecting the vertebro-costal ribs with the posterior border of the 

 suprascapula. Serratus superficialis arises by two digitations, the 

 most posterior of which springs from the outer surface of the 

 posterior extremity of the second sternal rib, while the larger or an- 

 terior one comes off from a similar point upon the first sternal rib. 

 Its fibres run forwards and upwards, and insert themselves upon the 

 hinder border of the suprascapula, at its postero-inferior angle. 



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