60 



INTRODUCTION. 



opposable thumb of primary importance^ places the 

 Opossums and Phalangers in the same group with 

 the Quadrumana and Bimana, giving to the group 

 the name of Cheiropoda, and dividing it as follows : — 



CHEIROPODA. 



Mammals 



with opposable 



thumbs. 



/" BlMANA. 



' on the anterior extre- 

 mities only, 



QUADRVMANA. 



on both anterior and 

 posterior extremities. 



»Homo. 



Simice. 



and with anthropoid 



teeth. 



LemitridfP. 



and with abnormal 



teeth. 



Simiadce. 



and with anthropoid 



teeth. 



Gliridce. 



on the posterior extre- -J and with rodent teeth. 

 V mities only 



Didelphidce. 



and with abnormal 



teeth. 



The arrangement adopted in this work, and that 

 which I originally published, in 1838, in the Cata- 

 logue of the Mammalia preserved in the Museum of 

 the Zoological Society, is as follows : — 



Families. Genera. 



Order 

 MARSUPIATA. < 



Families. 



DlDELPKID^. . 



Dasyurid.e. . 

 Myrmecobud.e. 



pERAMELIDiE, 



Macropodid^. 



Didelphys. 

 i Thylacinus. 

 •< Dasyurus. 

 ( Phascogale- 



Myrmecobius. 



/ Perameles. 

 (. Chseropus. 



{Macropus. 

 Hypsiprymnus. 



Sub-genera. 

 Cheironectes. 



r Phalangista. 



PHALANGISTID^.jp^^^^^^g^ 



L Phascolarctus, 

 Phascolomyid^. Phascolomys. 

 i Echidna. 

 VMonotremata. X Ornithorhyn- 

 ^ (_ chus. 



f Cuscus. 

 \ Pseudocheirus. 

 f Belidea. 

 \ Acrobata. 



