118 On the Judith River, Montana 



ground to doubt the sequence of the rocks here, 

 as laid down by Hatcher and Stanton. 



We followed the trail Professor Cope first 

 made, when we drove down to Cow Island in 

 1876, camping at the same spring at Lone Tree 

 for noon. The tree itself is now dead. We camp- 

 ed near our old one on the Missouri, forty miles 

 below Dog Creek, though now we had a wagon 

 road down through the badlands. On the roao 

 down along the badlands we never lost sight of 

 the rocks and always found the Bear Paw shales 

 on top of the Judith River beds, proving that I 

 had been mistaken again, and the Cow Island 

 beds were the same, as those on Dog creek, with 

 no rocks between. The only difference I could 

 see between them was the sculptury approached 

 more closely at Cow Island, those of the beds in 

 the Dead Lodge Canyon. 



Two things impressed me strongly, one was 

 the fact of finding an ischium, with a footed ex- 

 tremity, closely associated with teeth similar to 

 those Dr. Hayden picked up in this region, 

 and Leidy called Tmchodon mirabilis. We found 

 four trachodonts in the Dead Lodge Canyon the 

 most common was the crested one with footed 

 ischia. And not a one of them belonged to the 

 genus Trachodon. Neither have any been de- 

 scribed. There can be little doubt therefore that 

 Leidy's TracKodon mirabilis belongs to a dino- 

 saur with either a crested head or the high nosed 

 Qryposaurus of Lambe, or Kritosaurus of Brown. 



