DAKOTA AND NEBRASKA. 



215 



Inch. Lin. 



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

 Diameter of second " "12" 



Diameter of first " « 10 " 



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, .111 111 110 



Diameter transversely, . .27 25 27 



5. Measurements of two specimens of second or third upjier 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, . . . . .63 



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 " " 



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



Inch. Lin. 



Depth of lower jaw back of last molar, . . . .76 



Length of series of true molars. 



Diameter of last true molar, antero-posteriorly. 



Diameter of second " " 



Diameter of first " " 



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



