2l6 THE MALAGASY REGION. [CHAP. 



INSECTIVORA (cent.). 



POTAMOGALID^E. 



Geogale; i species. 

 CARNIVORA. 



VlVERRID^E. 



CryptoproctincR. 



Cryptoprocta -, i species. 



Viverrinae. 



Fossa ; i species. 

 Herpestinse. 



Galidictis (Striped Mungooses) ; 2 species. 



Galidia (Ring-tailed Mungoose) ; i species. 



Hemigalidia (Brown-tailed Mungoose) ; i species. 

 Euplerince. 



Eupleres (Small-toothed Mungoose) ; i species. 



RODENTIA. 



MURID/E. 



Hypogeomys ; i species. 

 Nesomys ; 2 species. 

 Brachytarsomys ; i species. 

 Hallomys; i species. 

 Eliurus; 2 species. 



UNGULATA. 



Sus (Potamochcerus) ; t species. 



HIPPOPOTAMID^:. 



Hippopotamus ; i species (extinct). 



Considering the fauna in more detail, it may be first mentioned 

 that the lemurs (Lemuroidea) differ from the higher, or Anthropoid 

 Primates by their generally lower grade of organisation, as well as 

 by certain features of the skull and internal anatomy which need 

 not be more fully noticed here. They all have fox-like, expression- 

 less faces ; and, with the exception of the aye-aye and the Asiatic 

 tarsiers, they are characterised by the innermost pair of upper 

 incisor teeth being separated from one another in the middle line. 



