THE PACA. 



135 



86. — Upper Ja,v of Paca. 



matic fold of skin, but this remains to be determined. 

 Besides the sac described, the pacas have true cheek- 

 pouches of considerable extent, o[)ening from the mouth, 

 and extending: down the sides of the neck and below the 

 inferior margin of the zygomatic shield. 



The lower jaw, which is almost concealed, is shown at 

 Fig, 87. The characters of the molar teeth, worn by 

 use, are well depicted. Fig, 88 represents the germ of 

 the first molar, before the tooth is completely developed, 

 in three views, namely, the outer aspect, the inner aspect, 

 and the crown with its tubercles. The pacas are animals 

 of considerable size, and of a heavy clumsy figure, having 



