DAKOTA AND NEBRASKA. 



51 



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Length of alveolar border to front of incisors, 

 Depth of lower jaw at coronoid process, 

 " " at last sectorial molar, 



" " at third premolar, . 



Length of alveolar border of lower jaw, 

 " symphysis of lower jaw, 

 upper molar series, . 

 lower molar series, . 

 upper true molar series, 

 lower true molar series, 



The following are comparative measurements 

 and n. horridus, taken from well preserved and 

 skulls : 



Breadth of first upper premolar, 



Length of " " 



Breadth of second " 



Length of " " 



Breadth of third " 



Length of " " 



Breadth of first upper true molar (obliquely). 



Length of " " " 



Breadth of second " " (obliquely), 



Length of " " " 



Breadth of upper sectorial molar, 



Length of anterior cusp of " 



Length of posterior lobe of " 



Breadth of first lower premolar. 



Length of " " 



Breadth of second " 



Length of " " 



Breadth of third " 



Length of " " 



Breadth of fourth " 



Length of " " 



Breadth of first lower true molar, 



of the teeth of Hyainodon crucians 

 little worn ones contained in two 



