Vol. 5] 



Kellogg. — Rodent Fauna. 



423 



Figs, la and 16. — Arctomys nevadensis. Portion of the left mandible with 

 P 4 , M 1; and the base of the incisor. No. 12506, natural size. 

 Pig. la, superior view; fig. lb, lateral view. 



Pig. 2. — Arctomys nevadensis. Portion of right mandible with incisor. 

 No. 12544, natural size. 



Pig. 3. — Arctomys minor. Portion of larger incisor. No. 12538, natural 

 size. 



Pig. 4.— Portion of maxillary with left P :l and P*. No. 12538, X 2. 



Pig. 5. — Arctomys minor. Eight M 2 and M 3 . No. 12538, X 2. 



Fig. 6. — Arctomys minor. Right P 4 , M 1 and M 2 . No. 12538, X 2. 



Fig. 7. — Arctomys minor. Portion of left mandible with M 2 and M 3 . No. 

 12538, X 2. 



