894 



on. C. F, SONNTAG ON THE CLASSTFICATIOX 



adaptive, but others cannot be included in that category. The 

 viscei'al and osteological characters are tabulated as follows : — 



1. Oral vestibule, palatal formula, tongue. 



2. Spleen, thymus, cervical lymph-glands. 



3. Division of the right axiricular appendix. 



4. Branches of the aortic arch. 



5. Number of dorsal vertebrte, ribs, intercostal soft parts. 



6. Relative length of facial part of skull. 



7. Characters of glenoid cavity. 



8. Size and perforations of lachrymal bone. 



9. Chai-acters of scapula. 



Text-fi2-ure 43. 



The scapula in Fhascolomys mitchelli (A.) : Phascolarctos ciuerens (B.) ; 

 and Fhalanger orientalis (C). 



Conclusions. 



From an examination of these four groups of characters I have 

 come to the following conclusion : — 



1. Phascolarctos cannot be included in the Phalangeridse. 

 Although dentition and foot structure have led some observers to 

 put it in that family in close relation to Pseudochirus, there are 

 many very important points in which it diflers from them. Jf 

 they are united it will be by superficial characters, and one will 



