342 SHOULDEE-GIRULE IN MONOTREMES, 



means of a tendon on the cianium anterior to and above the 

 meatus. She then states that the M. cleido-mast-oideus is absent. 



Leche follows Westling. 



MiVART describes the origin and insertion, and then remarks — 

 "It is an interesting fact that the sterno-mastoid does not arise 

 from the anterior border of the slioulder-girdle, but as it were 

 follows its own normal i)oint of attachment (the manubrium) 

 backwards behind the episternum. 



Ornithokhynchus. 



Owen describes the muscle as double on both sides. 



CoUES was unable to describe the origin of the muscle, as the 

 head of his animal was injured. He remarks — "The sterno- 

 mastoid is double on each side, unless one portion is cleido- 

 mastoid." 



Leche follows Cones, and expresses his opinion that the muscles 

 are but cleft sterno-mastoids. 



Meckel describes the muscle under the name of nutator 

 capitis. 



CuviER and Laurillard figure as (b^) the cleido-mastoi'lien ou 

 trachelien, and this is the superficial belly. Oit PI. 268, fig. 2 

 (6), is called sterno-mastoidien ou trachelien, and is evidently the 

 deeper (dorsal) belly of the muscle. 



M. ACROMIO-TRACHELIEN. 



Echidna : Levator davicida, Westling, Mivart, Leche. 

 Ornithokhynchus : Levator scapuke, Meckel ; Atlanto-acromiaiis, es 

 Atlanto-scapularis, Coues ; Acromio-trachelien, Cuvier and Laurillard. 



Echidna. 

 Origin. (a) Dorsal porliori of acromio-trachelien. — This 

 muscle has a small origin from the ventral asi)ect of the atlas ; its 

 chief origin being, however, from the basioccipital, and from the 

 mastoid region. That portion of its origin from the atlas and 

 occiput is connected with the tendon of origin of the muscle on 

 the opposite side by a delicate aponeurosis stretching ventral to 

 the atlas. 



