54 THE AMERICAN MUSEUM JOURNAL 
LacomyipD#&. Picas, or Tailless Hares. 
These are little animals looking like small Rabbits, but have 
fewer teeth. They are found in high mountain regions in the 
Old World and likewise in western North America. They have 
7 1 
Ae i 
i ae 
FIG. 26. SKULL OF PALAZAOLAGUS 
An ancestor of the hares. Oligocene of Colorado. Natural size 
been found fossil in Europe, but in America occur only in the 
latest geological epoch; in the Old World they seem to have 
taken the place of the true Hares, which were limited to the New 
World until the end of the Tertiary period. 
V. MARSUPIALIA. 
All the living marsupials are inhabitants of Australia and the 
adjacent islands, except the Opossums and a rare genus of Rat- 
FIG, 27. SKULL OF THE OPOSSUM 
Shows the peculiar dentition of the marsupials. Half natural size 
Kangaroos from South America. In Australasia they take the 
place of the mammals of the other continents, none of which occurs 
