DAKOTA AND NEBRASKA. 325 



The coronet bone is ten lines long, thirteen lines broad at the upper end, and 

 twelve lines at the lower end. 



The coffin bone has its base more angular in outline than in the Horse, arising 

 chiefly from its anterior part being prolonged. The apex of the prolongation presents 

 the peculiarity of being deeply notched. The body of the bone appears also more 

 angular, than semi-circular as it is in the Horse, arising from its being more prominent 

 forward. The bone at its lower part is comparatively rugose and perforated. Its 

 measurements are as follow : 



Height of anterior slope. 



Breadth of the spreading base, . • . 



Antero-posterior extent of the base, . 



Breadth of articular surface. 



Projection of angles laterally beyond the latter, 



30. A metatarsal bone, smaller than that last described, from the Niobrara River. 

 Its length is six inches and seven lines ; the breadth of its proximal end is eleven 

 lines, and of its distal end ten lines. 



31. Two upper fragments and eleven lower fragments of metatarsals, from the Nio- 

 brara River. One of the upper fragments is considerably larger than the correspond- 

 ing portion of either of the whole bones last described, and the other fragment is 

 slightly smaller than either. The breadth of the proximal articulation of the larger 

 one is fifteen lines ; of the smaller one ten lines. Of the lower fragments the largest 

 has its articular surface fifteen lines in breadth ; a second measures thirteen lines ; a 

 third twelve lines, and the smallest measures eleven lines. 



32. Thirteen pasterns, from the Niobrara, exhibit a variety in size, as indicated by 

 the following measurements of half a dozen of them : 



Lines. Lines. Lines. Lines. Lines. Lines. 





Lines. 



. 17 





. 17 





. 18 





. 12 





. 3 



Length, 



. 23 



22 



20 



m 



17J 



15 



Breadth of proximal end, 



. 14 



12 



14 



12 



12 



12 



Breadth of distal end, . 



. 12i 



lOi 



11 



9^ 



8 



Sh 



Breadth of middle of shaft. 



. 10 



8 



9 



8} 



7i 



8i 



33. Four small coronets, of which one is from Loup Fork, the others from the Nio- 

 brara. They present the following dimensions : 



Length, ..... 



Breadth proximally, .... 

 Breadth distally, .... 



Lines. 



Lines. 



Lines. 



Lines. 



12 



11 



11 



10 



15 



14 



13 



15 



Ui 



13i 



11 



13* 



