Expedition to the Bad Lands 87 



rise to pus and thick scabs. They got under the 

 saddles and girths too, irritating the horses almost 

 beyond endurance. We were forced, for lack of 

 something better, to cover our faces and arms with 

 bacon grease and to rub the skins of the horses 

 under the collars and saddles with the same disa- 

 greeable substance. 



Fossil bones always partake of the characteristics 

 of the rock in which they are entombed, and here 

 they were quite hard when we got in to where the 

 rock was compact. The Professor found here 

 the first specimen ever discovered in America of 

 the wonderful horned dinosaurs; Monoclonius he 

 called the first species. I assisted him in digging 

 out his specimen of M. crassus, a species distin- 

 guished by a small horn over each orbit, and a large 

 one on the nasal bones; and I myself discovered two 

 species new to science. One of these, an M. spheno- 

 cerus, was six or seven feet high at the hips, and, 

 according to Cope, must have been twenty-five feet 

 long, including the tail. It has a long compressed 

 nasal horn, and two small horns over the eyes. 



Professor Marsh later discovered a similar form 

 in these same fossil beds, and named it Ceratops 

 montanus. 



The species I discovered were collected on the 

 north side of the river, three miles below Cow 

 Island, after the Professor had taken the last boat 



