Williston: restoration of platygonus. 37 



deeper notch for the biceps tendon with its posterior border more 

 prominent, a depression below the rim, instead of a large protuber- 

 ance, for the attachment of the subscapular muscle, a more promi- 

 nent anterior border and greater width of the shaft just below the 

 stronger deltoid tubercle, than in Dicoiyles. The supratrochlear 

 fossa is not perforated. 



Length of humerus 19S mm. 



Transverse diameter of anicular surface 38 



Antero-posterior diameter of shaft just below tlie 



deltoid tubercle 33 



Distance between epicuiitl) lea 40 



Ulna-radius. 



The fore arm is, relatively, a little longer than in Dicotylts. It is 

 distinctly less arched on the distal half, the thinner superior border 

 of the olecranon process is inflected more, making the inner surface 

 more concave, and the concavity of the ulna border inferiorly is 

 more nearly uniform posteriorly. 



Extreme length of the ulna 212 ram. 



Length of radius from margin of sigmoid fossa . . . . 15S 



Width of sigmoid fossa 30 



Width of articular surface distally 40 



Least width of conjoined bones 27 



Carpus. 



The carpus, as well as its individual bones,, is broader, the inner 

 one of the second row is more distinctly visible from in front, there 

 is a more distinct opening on either side of the lunar, and the scaph- 

 oid, cuneiform and trapezoid do not project as prominently on the 

 under side. 



Width of carpus 36 mm. 



Length on inner side 27 



Length on outer side 29 



Metacarpals. 



The middle metacarpals are relatively longer and are directed 

 more nearly in the axis of the forearm than in Dicotylcs. The sec- 

 ond metacarpal is represented by a short splint about one-third of 

 the length of the third, and which, in some specimens, shows an 

 epiphysial end. It articulates in the same manner as the better 

 developed bones in the peccaries. The fifth is represented by a 

 small nodule of bone articulating with a small facet on the upper end 

 of the fourth metacarpal. There is a small nodule articulating with a 

 small facet on the trapezoid, which probably represents the first digit. 

 In the drawing the splint is wrongly represented articulating with 



