6 PROCEEDINGS or THE NATIONAL MUSEUM vol. 79 



The specimen consists principally, if not entirely, of the frontal 

 bones, which display the characteristic thickening that forms a dome 

 above the brain. In size it agrees very closely with the partial 

 skull described by Lambe ^ as T. vdlid'm from the Belly River of 

 Alberta. In size, thickness of dome, surface sculpturing, and in the 

 ventral view showing the contribution to the walls of the orbit and 

 brain case, the two specimens, so far as they can be compared, appear 

 to be identical. A question is thus raised as to the distinctness of 

 the two species. The materials in hand are not yet sufficient for a 

 positive determination of this point, but in the light of this frag- 

 mentary specimen, the possibility of their being one and the same 

 thing is indicated. In that event, T. validus would become a syno- 

 nym of T. formosus, which has priority by many years. 



« Trans. Boy. Soc. Canada, ser. 3, vol. 12, pi. 1, flg. 1, 1918. 



•. •■ CCVERNMENT PRINTINS OFFICE: IBSI 



