EXTERNAL CHARACTEES OF THE KOALA. 



597 



ridge seen in Trirhosurus is represented by a lobate thickening, 

 and there is a similar thickening lower down behind, above the 

 posterior end of the supratragus. The anterior ridge forms a 

 lobate expansion above the anterior end of the snpratragus, 

 and the tragns itself is less well defined.. The ridge behind the 



Text-ficrure 28. 



A. Head oiFhascolarctos cinereiis, with position of clieel; -pouch (p) dotted in and 



pocket of ear (o) seen from above. 



B. Nose and part of palate of the same, showing the nostrils and the orifices of the 



cheek-pouches {p). 



C. Nose and mouth of Fhascolomys ursinus, with lower incisors cut short and 



flap of skin (f) projecting into mouih. 



D. Side view of rhinarium of the same. 



E. Ear of Lasiorhinus latifrons, from dried skin softened in water. 



