U. S NATIONAL MUSEUM 



PROCEEDINGS. VOL. 79, ART. 9 PL. 1 



Trcodon Skulls 

 1, Skull of Troodon ut/omingensis. Tjpe, U.S.N.M. No. 12031. Viewed from left side. About one- 

 fourth natural size; 2, skull of Troodon validus Lambe, viewed from the left side. Specimen in the 

 University of Alberta Museum, Edmonton, Canada. About one-half u'ltural size. 



