EXTEKNAL CHARACTERS OF THE KOALA. 



595 



of the three genera of Phalangers above described. It extends 

 dorsally, however, furtlier backwards in the middle line, and the 

 hair of the muzzle encroaches over the well-developed slit of the 

 nostrils, the expanded portions of which are widely separated in 

 the middle line. The infranaiial portions ar-e moderately deep, 

 and reach almost to the posterior end of the nostril- slits. 



Text-figure 22. 



A. Head of Pseudochirtis peregrinus, witb pocket of ear (a) seen from above. 

 13. Rbiuarium of the same. 



C. Ear of Trichosurus vulpecula. 



D. Rbinarium of tbe same, from the front. 



E. Rbinarium of tbe same, from the side. 



F. Head of Fhalanger maculatus, the ear stripped of hair. 



G. Rbinarium of the same, from tbe front. 



Their inferior edge slopes obliquely downwards and inwards to 

 the gum of the incisors, the two lobes of the upper lip being 



