310 SHOULDER-GIRDLE IN MONOTREMES, 



and the clavicular border, between the acromion and shoulder 

 joint and its insertion into the greater tuberosity. 



Leche follows Westling. 



MiVART notices that "the muscle has a very extensive origin, 

 arising as it does from almost the whole of the inner surface of 

 the scapula not occupied by the serratus magnus." He further 

 calls attention to the fact, " that Owen has pointed out that the 

 supraspinous fossa is on the inner surface of the scapula." 



OP.yiTHORHYNCHUS. 



Owen says — " The subscapulaiis is a narrow muscle, and 

 narrower in reality than at first sight it appears to be, since the 

 supraspinatus, from the inflection of the spine and acromion, 

 ai'ises from the same aspect of the scapula and appears to form the 

 anterior fasciculus of the subscapularis ; its distinct insertion into 

 the anterior tubercle of the head of the humerus points out its 

 true nature." 



CouES gives an exact description of this small muscle. 



Leche merely remarks "that there is a similar muscle in Orni- 

 thorhynchus as in Echidna," and refers to Coues. 



Meckel — "Extrorsum tres sequuntur musculi, ... ex 

 his primus, anticus, minimus, sine dubio supraspinatus, a praece- 

 dente, longe majore, tectus ab acromii facie inferiore ad capitis 

 ossis humeri basin tendit, fortiter os attollens." 



Cuvier and Laurillard figure this muscle (PI. 266, tig. 2, 

 without a reference number), as a small band running down 

 between the epicoraco-humeral (P) and the infraspinatus (m). 



MivART remarks — " In the Ornithorhynchus this muscle must 

 be considerably smaller than in the Echidna, owing to the situation 

 of the subscapularis in that genus." 



M. SUBSCAPULARIS. 



Echidna : Subscapularis, all authors. 



Ornithorhynchus : Owen and Meckel describe only the portion arising 

 from the internal face as subscapularis ; part of the teres major of Coues. 



