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THE AMERICAN MUSEUM JOURNAL 



America. A tiny fossil Rodent, Metiiscomys of the Oligocene 

 epoch, is thought to be ancestral to it. 



FIQ. 25 THE HORNED RODENT, CERATOGAULUS 

 Skull and lower jaw. Middle Miocene of Colorado. Natural size 



Mylag.\ulid.«. Extinct. Miocene. 



Curious little Rodents with digging claws on the fore-feet, very 

 wide short head and peculiar teeth. One skull in the case, the 

 Ceratoganlns, or Homed Rodent, shows a large boss indicating a 

 horn on the nose, which gives it an odd likeness to a rhinoceros 

 skull. They are very rare fossils, found only in North America. 



Castorid.-e. Beavers. Oligocene to Recent. 



Fossil Beavers of small size have been found in the Tertiary 

 beds of both America and Europe and several skulls are shown 

 in the collection. In the Quaternary beds are found remains of 

 Beavers scarcely to be distinguished from the living species. 



