BY W. J. S. McKAY. 315 



part of the serratus, and also with the rhomboid insertion. The 

 tendon of the posterior part of the trapezius overlies it, as also 

 does the dermo-dorsi cervicalis. At its insertion its tendon lies 

 between the short head of the triceps arising from the posterior 

 face of the humerus, and the insertion of the coraco-brachialis 

 brevis and epicoraco-brachialis on the antero-internal face. 



Innervation. ErJdchia et Omithorhynclius : from the cord 

 formed from the iv., v., and vi. cervical nerves, and from which 

 the subscapular nerves also spring. (Figs. 13, 16 ; 35). 



Westling : idem for Echidna. 



Echidna. 



Westling desci-ibes the origin from the posterior angle of the 

 scapula with the scapular portioa of the latissimus dorsi, and its 

 insei'tion distally from the tuberculum minus between the inser- 

 tion of the M. coraco-brachialis brevis and the origin of the triceps, 

 on a ridge on the humerus. 



Leche follows this description. 



MiVART givesasimilar description, remarking that "this muscle 

 appears to be considerably larger in the Ornithorhynchus," and 

 refers to Meckel. 



Ornithorhynchus. 



OwEX remarks — "The infraspinatus and the large teres major 

 cover the whole external surface of the scapula." 



CouES says — " Double ; both portions of great size, and per- 

 fectly distinct. The lower, or teres major proper, arises fleshy 

 from the posterior extremity of the scapula for about one-third of 

 an inch"; it lies at first upon the serratus magnus, and then along 

 the superior border of the latissimus, forming a great pyramidal 

 muscle running between the last and the upper teres, rapidly 

 narrowing to a rather long, stout, flattish tendon that passes 

 behind (mesiad of) the scapular head of triceps, to be inserted in 

 the posterior ridge of the humerus, one-half inch or more above 

 the insertion of tlie latissimus." Coues then goes on to describe 

 " the ui)per portion," which is really the true subscapularis. 



