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The Gopher Tortoise (T. Carolina ), Southern States. 
The Common Tortoise (T, grczca), Europe. 
The Great or Elephant-footed Tortoise (Tcstado ele- 
phantopus) of the Galapagos Islands and the Brazilian Tor¬ 
toise ( Testudo tabulata ) are both South American forms. 
Turtles inhabit the whole tropical and temperate zones. 
The saurians comprise alligators, crocodiles, and their al¬ 
lies, and are found in tropical regions of the whole world. 
A number of the common alligators are kept here. The 
Rough-Eyed Caiman ( Caiman sclerops) is from South 
America. 
Alligators are easily distinguished from most crocodiles by 
their broad rounded muzzles, in the last this region being 
more or less constricted and pointed. 
the prairie-dog village. 
No. 22.—THE PRAIRIE-DOG VILLAGE. 
The Prairie Marmot ( Cynomes ludovicianus ), otherwise 
known as “prairie dog,” is a small burrowing rodent, much 
resembling the spermophiles, which are common throughout 
the western part of the United States. 
