DAKOTA AND NEBRASKA. 



215 



Inch. Lin. Inch. Lin. 



Diameter of third premolar, antero-posteriorly, 1 5 ; transversely, 1 11 



Diameter of second " " 12" 17 



Diameter of first " ^' 10 " 9 



2. Measurements of three specimens of second upper true molars : 



Inch. Lin. Inch. Lin. 



Diameter antero-posteriorly, . . .4 3 7 



Diameter transversely . . . .34 34 



3. Measurements of two specimens of first upper true molars : 



Inch. Lin. 



Diameter antero-posteriorly, . . . . . 2 11 



Diameter transversely, . . . . .31 



4. Measurements of four specimens of third or fourth upper premolars: 



Inch. Lin. Inch. Lin. Inch. Lin. 



Diameter antero-posteriorly, . 1 11 1 11 1 10 



Diameter transversely, . .27 25 27 



5. Measurements of two specimens of second or third upper premolars : 



Inch. Lin. 



Diameter antero-posteriorly, . . . . .18 



Diameter transversely, . . . . .21 



6. Measurements from a fragment of a lower jaw in Dr. Owen's collection : 



Inch. Lin. 



Depth of lower jaw back of last molar, . . . . .6 



Length of true molar series. 



Diameter of last true molar, antero-posteriorly, 



Diameter of second " " 



Diameter of first " " 



Diameter of last premolar, " 



Diameter of third " " 



Inch. Lin. 



3 6 



3 4 



Inch. Lin. 



2 8 



2 9 



Inch. Lin. 



1 10 



2 7 



Inch. Lin. 



1 6 



2 



9 

 4 

 3 

 2 

 1 

 1 



3 



4 



3 

 9 

 4 



7. Measurements from two fragments of a lower jaw in Dr. Prout's collection : 



Inch. Lin. 



Depth of lower jaw back of last molar. 

 Length of series of true molars. 

 Diameter of last true molar, antero-posteriorly. 

 Diameter of second " " 



Diameter of first " " 



7 



10 



4 



3 



9, 



6 

 9 

 G 

 3 



8 



8. Measurements from a fragment of a lower jaw in Prof Hall's collection : 



