OF THE WOMBAT, KOALA, AND PHALANGERS. 



865 



Pretracheal Muscles: — In all the animals described in this 

 paper the sterno-hyoid muscles could easily be separated from the 

 subjacent sterno-thyroids. The stei'no-hyoids are fused in 

 Phascolarctos and have no connection to the hyoid bone, so they 



Text-fisrure 31. 



..-^ 



MASSETER- -<££g>.- pg. 



The masseter muscle in Phascolomys mitcJielli (A.), Fseudochirus peregrimis (B.), 

 and Phalmigei' orientalis (C.) ; D: the ansa hypoglossi in Fhalanger 

 orientalis. 



C 2 and C 3 : cervical nerves ; A-H : ansa hypoglossi ; P.G : parotid glands 

 XII : hypoglossal nerve. 



play no part in its movements. But in all other species they are 

 separate and receive an insertion to the hyoid. The sterno- 

 thyroids are essentially similar in all. 



Hyoglossus : — Young (14) describes it as a transverse band, 

 bridging over the genio-glossi, and having no hyoid attachment 



