X BY W. J. S. McKAY. 345 



proiier, with which it is inserted, fleshy on to the antero-internal 

 suiface and upper border of the scapula near its apex." 



Leche follows Coues and Meckel, and describes two portions 

 under the names " P. ventralis," inserted on the crista scapulae, 

 and " P. dorsalis," inserted on the basis scapulfe. 



Meckel says, "levator scapuhi.' in duos divisus videtur." He 

 then gives a full description of the two jtarts. 



Cuvier and Laurillard, in Pi. 266, fig. 2, show the superficial 

 one of these muscles as " tZ " the omo- ou acromio-trachelien, and 

 it appears to us that the letter (a) quite close to (d) is on the 

 deeper part of these muscles, although {g) is taken as part of the 

 serratus magnus, and is called grand dentele (scapulo-costien). 



M. OMO-HYOIDEUS. 



Echidna et Ornithorhynx'HUS : Omo-hyoid, all authors except Meckel ; 

 Omo-mylo-hyoidtus, Meckel, 



Echidna. 

 Origin. The omo-hyoid arises from a ridge on the inner face 

 of the scapula immediately distal to the dorsal border of the origin 

 of the snpraspinatus. 



Insertion. Passing forwards and inwards under the 

 acromio-trachelien and sterno-mastoid, then under the large sub- 

 maxillary gland, the muscle approaches the hyoid. It now splits 

 into a superficial and a deep layer. The deep (dorsal) layer is the 

 smaller, and is inserted on the basihyal ; the superficial (ventral) 

 is continued on and is inserted chiefly into a median raphe common 

 to it and the stylohyoid ; some of the fibres, however, are lost In 

 the aponeurosis covering this region. 



There is no tendinous intersection in this muscle. 



Ornithorhynchus. 

 Origin. The muscle arises from the inner surface of the 

 scapula from a small area situated between the origin of the 

 snpraspinatus and the ventral extremity of the true anterior costa. 



