U, S NATIONAL MUSEUM PROCEEDINGS. VOL 79. ART. 9 PL 3 



Skull of Trcodon wyomingensis 

 1, T.v|;e, f.S.X.Isr. Xo. 120.31. Viewed from the right side; L', the 

 same, viewed from below. 0, Hoof of orbital cavities. Both figures 

 about one-fourth natural size. 



