868 



DR. C, F. SONNTAG ON THE MYOLOGY 



attached to the hyoid bone in my specimen of Phascolarctos, for 

 the pharyngeal constrictors have no liyoid origin. 



Scaleni: — In all forms the scalenus anticus is absent, as the 

 scalene group is behind the brachial plexus. The scalenus medius 

 and posticus ai-e present. 



Sjylenius : — In Phascolarctos it is divisible into two parts 

 (capitis and colli), but it is a single sheet in Phascolomys and the 

 Phalangers. 



Prevertebral Mioscles : — Young (14) described these muscles 

 in Phascolarctos, and pointed out that they are more or less 



Text-figure 34. 



M-H.M. 



M.M. 



Anatomy ol tlie neck in Fseudocliiriis peregrinus. 

 Letters as in text-fig. 32. 



inseparable. The rectus capitis anticus major is the largest ; it 

 runs from the bodies of the first three dorsal vertebra) and all 

 cervical transvei'se processes to the basi-occiput. Rectus capitis 

 anticus minor cannot be isolated. Longus colli consists of fibres 

 lunning between the bodies and transverse processes of the fii'st 



