XX 



Class MAMMALIA. 



Subclass I. IMPLACENTALIA. 

 Order I. MONOTREMATA. 



Page 



Genus Ornithorhynchus 115 



Echidna . . . 115 



Order II. MARSUPIALIA. 



Genus Didelphis 116 



Order III. RODENTIA. 



Family Leporida. 



Genus Lepus 117 



Family Caviidas. 



Genus Cavia 117 



Family Jerboida. 



Genus Dipus 117 



Sciurus 117 



Sciuropterm 118 



Muscardinus 118 



Family Hystricidce. 



Genus Hystrix 118 



Erethizon 119 



Family Muridee. 



Genus Mus 119 



Family Aspalacidas. 



Genus Bathyergus 120 



