THE CANADA SAND-RAT. 



93 



views : 4, lower jaw ; 5, palate and upper teeth'; 6, 

 upper grinder magnified. Fig. 54 represents tiie teeth 

 of Geoniys (Saccomi/s, F. Cuv.) enlarged. 



The skull is large and depressed, the nose short, the 

 nasal and frontal bones are in the same plane ; the palate 

 is very narrow, and the zygomatic arch is but little de- 

 pressed below the upper surface of the skull. 



Feeth of Canada Saud-Kat. 



The nostrils are somewhat lateral ; the mouth is con- 

 tracted ; the pendulous cheek-pouches are thinly clothed 

 with short hairs, and sometimes almost naked — they open 

 into the mouth by the side of the molar teeth ; auditory 

 openings large, external ear almost obsolete ; eyes small 

 and far apart ; body cylindrical ; tail of moderate length, 

 round, tapering, and more or less hairy. Limbs short; 

 toeSj five on each foot, with strong claws. (Fig. 55.) 



