DAKOTA AND NEBRASKA. 101 



Lines. 



Length of axis iiiferiorly, including odontoid process, . . .45 



Width at the anterior articular processes, . . . . .41 



Breadth of abutments of the vertebral arch, . . . .15 



Breadth of arch at root of spinous process, . . . . .24 



Width at posterior articular processes, . . . . .26 



Width at posterior articular surface of body, . . . .19 



Height of do. exclusive of the hypapophysis, . . . .17 



Height of spinal canal in front, . . . . . .11 



Width of spinal canal in front, . . . . . .13 



The fragments of bones of the limits, apparently from two different individuals, are 

 supposed to belong to Elotlierium Mortoni from their relative size and their approach 

 in anatomical character to those of recent suilline animals. They consist of a muti- 

 lated proximal extremity of the humerus, two distal ends of that bone, two proximal 

 ends of the conjoined ulna and radius, two distal ends of femora, the proximal end of 

 a tibia and two distal extremities of the same, one of which has a portion of the 

 fibula co-ossified. 



The humeral fragments nearly resemble in form the corresponding portions in the 

 Peccary. The outer portion of the articular surface of the external condyle forms a 

 sloping plane backward, instead of a groove as in the animal just mentioned. 



The ulna and radius are closely conjoined, but are separable in the si^ecimens. It 

 would appear as if in advancing years they became co-ossified as in the Peccary, 

 though perhaps not so completely. The ulna in its relative size with the radius is 

 about as well developed as in the Hog. 



The lower end of the femur has its shaft more flattened laterally than in the Hog 

 or Peccary. Above the trochlea for the patella there is a deep concavity, and above 

 the external condyle a well-marked roughened impression for muscular attachment. 

 The articular surface of the external condyle is disconnected with that of the 

 trochlea, and the articular surface of the internal condyle joins it by a narrow 

 isthmus. 



The extremities of the tibia, and that below of the fibula, pretty closely resemble 

 the same parts in the Hog and Peccary. The articulation of the ankle joint is nearly 

 equally divided into fore and aft oblique concavities by an intervening ridge of 

 the tibia, as in other suilline animals. 



Measurements of the fragments above indicated are as follow : 



Lines. 



An tero-posterior diameter of humerus at head, . . . .31 



Circumference of shaft 4 i inches below the head, . . . .34 



