RODENTIA. 





Skull, Teeth, and Paws of Aplodontia. 



seen from above ; 4, lower jaw with right condyle broken,^ 

 seen from above ; 5, upper molar tooth; 6, 7, fore foot, 

 upper surface ; 8, sole of hind foot. 



The Rodentia, as the name implies, have the teeth 

 constructed for gnawing, paring, or scraping down the 

 substances on which they feed. The teeth are only of 

 two kinds, incisors and molars. There are no canines ; 

 and between the incisors, which project from the very 

 apex of the jaws, and the molars, which are situated far 

 back, there intervenes an unfilled space of considerable 

 extent. The incisors are universally two in number in 



b2 



