DAKOTA AND NEBRASKA. 



187 



Inches. 



Lengtli of nasal bones from the widest part, between the points of the 



frontal angular processes, and their anterior extremity, . . .41 



Greatest width of jaw outside of the second true molars, . . .4 



Narrowest part of the jaw above the second premolai's, . . . 2i 



Width of jaw outside of the canine alveoli, . . . . . 3i 



Length of space occupied by the molars and canines, . . .8 



Length of space occupied by the true molars, . . . . 2i 



3. A much mutilated specimen consisting of portions of both jaws, -with teeth, of 

 a middle-aged adult, from the same collection as the preceding. In the upper jaw 

 on the two sides together it contains a full series of premolars ; in the lower jaw, a 

 series of the back three premolars and the first true molar. On one side the third 

 lower premolar had been lost at an early period, and one of its sockets is obliterated. 

 The concave interspace between the second and fourth premolars measures an inch 

 and a half. The last two premolars and the true molars are close together. 



Measurements from the specimen are as follow : 



Lines. 



Length of crown of first upper premolar (blunted), . . . .6 



Antei'o-posterior diameter of do., . . . . . . 7J 



Length of crown of third upper premolar (blunted) , . . . 9i 



Antero-posterior diameter of do., . . . . . .11 



Length of crown of upper fourth premolar, . . . . . 7J 



Antero-posterior diameter of do., , . . . . .Si 



Length of crown of last lower premolar, .... 9 



Antero-posterior diameter of do., . . . . . .12^ 



4. A specimen from Dr. Owen's collection, consisting of a portion of the upper jaw 

 of an adult individual. It contains on both sides the anterior two true molars, and 

 the fangs of the premolar in advance and of the true molar behind. The retained 

 true molars are slightly worn at the summit of the lobes. The specimen is repre- 

 sented in figure 1, plate xi, of Dr. D. D. Owen's Geological Survey of Wisconsin, &c. 



The measurements are as follow : 



Width of face above the second true molars. 

 Height on the same line from the hard palate. 

 Space occupied by the upper true molars, . 

 Antero-posterior diameter of first true molar. 

 Transverse " " " 



Antero-posterior diameter of second true molar. 

 Transverse " " " 



Lines. 



44 

 42 

 32 

 10 

 10 

 11 

 11 



