BY W. J. S. McKAY. 307 



the nerve supply she siiys, " eiii Theil des Ramus supra- und inf la- 

 spinatiis des N. supracoracoideus durchsetzt den M. supraspiuatus 

 und dringt in den medialen Rand des M. infraspinatus ein ; 

 hauptsachlich wird jedocli der Muskel durch mehiere Aestchen 

 von) N. axillaris, die in die Lateralfliiche eintreten, versorgt." 



Leche follows Westling, but quotes the latter part only of 

 Westling's statement about the nerve supply. 



MiVART describes the origin and insertion as given above, and 

 remarks that " the muscle in the Ornithorhyuchus which is 

 figured by Meckel (tab. vii. No. 13) and named by him deltoides, 

 appears to be the same as that which 1 have named infraspinatus 

 in the Echidna." The muscle referred to is in PI. vi. not PI. vii., 

 and is the posterior portion of the deltoid and is quite accurately 

 figured and named by jNIeckel : there is, however, a mistake in 

 this plate (see below). 



Orxithorhynchus. 



Owen remarks, that " the infraspinatus and the teres major 

 cover the whole of the external surface of the scapula." 



Leche does not mention this muscle under niithorltynchus. 



CoUES writes — " Infraspinatus (and teres minor ? or the latter 

 wanting'?) occupies, and arises fleshy from, the whole of the 

 scapular plate below the spine and spinous elevation, this is, between 

 the last named and the origin of the scapular head of the triceps." 



Meckel— '" Extrorsum tres sequuntur musculi . . . secun- 

 dus infraspinatus, medius, longe major a media scapuhe facie 

 externa tuberi ossis humeri antico inseritur infra et extrorsum a 

 modo dicto." 



CuviER and Laurillard figure this muscle (in PI. 266, fig. 2, m) 

 under the name " sous-epineux (sous-scapulo-trochiterien)," but in 

 fig. 1, PI. 266, m, is really part of the subscapularis. 



Meckel (in PI. vi. 14) figures as infrasjjinatus what is only 

 part of the subscapularis. This is plainly seen to be a mistake, 

 as the long head of the triceps is seen arising from the glenoid 

 ridge in front of (dorsal to) the muscle represented as infra- 



