866 



DR. C. F. SONNTAG ON THE MYOLOGY 



in PhasGolarctos. I did not, however, observe this band at all. 

 Macalister (5) regarded it as a piece of the mylo-hyloid. In . 

 Phascolomys and the Phalangers it runs from the hyoid bone to 

 the tongue. 



It is, therefore, evident that the Koala has many traces of 



Texfc-figure 32. 



Dig.M. 



S-H.M. 



S-M.M 



CL-M.M 3-H.M. T.M. CL. 



Anatomy of the neck in Phascolomys initchelli. 



CL : clavicle; CL-M.M: cleido-mastoid ; C.L.T: cervical thymus; Dig.M: 

 digastric ; E.J.V : external jugular vein ; L.C.C. A : left common carotid 

 artery; M-H.M : ra3lo-hyoid ; M.M : masseter; 0-H.M : omo-hyoid; 

 P.F.V: posterior facial vein ; S-H.M: sterno-liyoid ; S-M.G : submaxillary 

 gland; S-M.M: sterno-mastoid ; T.M: trapezius; XII; hypoglossal 

 nerve. 



primitive lamination in its platysma, mylo-hyoid, sterno-hyoid, 

 and hyoglossus muscles. And in these conditions it differs 

 entirely from Phascolo'tnys and the Phalangers. 



Sterno-mastoid, Cleido-mastoid, Cleido-occi'pital (text-fig. 32, S-M. 

 M, Cl-M, Cl-0) : — All are present in the Phalangers, but the 



