DAKOTA AND NEBRASKA. 



323 



Length, ...... 



Breadth of proximal end, .... 



Breadth of distal end, .... 



The measurements of the coffin bone are as follow 



Line9. 



14 

 20 

 20 



Height of anterior slope, 



Breadth of lateral spread, . 



Extent of spread antero-posteriorly, 



Breadth of articular surface, 



Projection of angles laterally beyond the same, 



24. Five lower extremities of humeri, pertaining to equine animals smaller than 

 the Ass, from the Niobrara River. They agree in form with the corresponding por- 

 tion of the humerus of the Horse. Their comparative measurements are as follow : 



Liae3. 



23 



24 



24 



20 



4 



Lines. Lines. 



Lines. Lines. 



Lines. 



23 



21 



20 



19 



15 



26 



23 



22 



21 



18 



16 



14 



13 



12 



10 



Breadth of the articular surface, 

 Width of the internal condyle, 

 Width of the external condyle, 



25. Six lower ends of tibioe of small equine animals, from the Niobrara River. 

 They are about one-half the diameter of the corresponding portion of the same bone 

 of the Horse, and they differ but slightly among themselves in size and proportions. 

 The measurements of the specimens are as follow : 



Lin. 



Breadth of the articular end, . . 20 



Width of do. internally, . . 14 



Width of do. externally, . . 11 



Circumference of shaft two inches and a 

 quarter above the lower end, 



Lin. 



Lin. 



Lin. 



Lin. 



Lin. 



20 



19 



19 



18 



18 



14 



14 



13 



13 



12 



10 



9 



9 



11 



9 



37 



37 



35 



32 



26. A patella of a small equine animal, from the Niobrara, not quite so broad in 

 relation with its depth as in the Horse. Its measurements are as follow : breadth 

 twenty-one lines; depth twenty-three lines; breadth of articular surface twenty 

 lines ; depth sixteen lines. 



27. Twelve astragali of equine animals, from the Niobrara River. The largest is 

 little more than half the diameter of that of the Horse, and from this they exhibit a 

 series decreasing to little more than one-third the diameter of that of the Horse. In 

 anatomical detail of form they agree with that of the latter. The measurements of 

 two of the largest, two of intermediate size, and two of the .smallest, are as follow: 



