A^oi] COPE OJ^ MIOCENE FAUNJ3 OF OREGON. 65 



The pJialanges are more depressed titan in any genns of Artiodactyla 

 known to me, excepting Hiijpoiwtamus. The proximal articnlar smface 

 of the first is gently concave, with the anterior border not produced. 

 The shaft is not contracted, and is regularly convex above or anteriorly. 

 The distal articular face is narrower above and not produced. The 

 superior border of the proximal face of the second phalange is produced 

 medially. The distal face is narrowed and produced upwards, so as to 

 stand in high relief, from which it results that the middle of the shaft is 

 very concave above. The external and internal borders of the inferior 

 or posterior part of the distal face, are produced backwards, covering 

 lateral basal ridges of more than half the length of the shaft, which form 

 the inferior border of lateral fossse. One unguis is preserved. It is 

 distinct in form from that of Sippojyotamus, Sus, or Dicotyles, and re- 

 sembles that of the llama. It is short, obtuse, and compressed. The 

 external face is nearly plane fore and aft, and slightly convex vertically. 

 The inner is convex fore and affc, and concave vertically. The profile 

 descends steeply to the apex, the curve commencing but httle beyond 

 the base. The inferior face is at right angles to the interior face, and is 

 moderately wide. 



Measurements of the Phalanges. 



M. 

 Median leiigtli of first of M. IV ■ 0.066 



Proximal diameter ( antero-posterior 0.042 



i transverse 0.055 



Distal diameter 5 antero-posterior (median) . . 0.030 



\ transverse (greatest) 0.055 



Median lengtli of second phalange 0.055 



Diameter of second phalange proximally J antero-posterior 0.035 



*= ^ ^ < transverse 0.045 



Diameter of second phalange distally \ antero-posterior 0.032 



< transverse 0.041 



Length of ungual phalange helow 0.042 



Proximal diameter of ungual phalange... . ^antero-posterior 0.032 



^ '■ * d transverse 0.025 



The femur is slender as compared with the humerus, and of moderate 

 length. The great trochanter is produced, but not beyond the line of 

 the convexity of the head, and is not much recurved. The expanse 

 externally is about as great as that of the head internally. The tro- 

 chanteric fossa is not large, and is cut off below by a plane surface at 

 the base of the great trochanter, whose superior border forms a curved 

 line connecting the great and little trochanters. The latter is large and 

 projects well inwards. The fossa lirjamenti tcris is large and central, 

 having no connection with the border of the head of the femur. The 

 posterior side of the shaft is flat, and the anterior face regularly convex. 

 The two faces meet externally in a well-marked representative of the 

 linca as2)cra. The rotular face of the feraiu- is short and wide, with the 

 borders somewhat oblique, and the inner edge is higher than the outer 

 at its proximal part. It is strongly convex from above downwards, and 

 BuU. V, 1 5 



