330 0. C. Marsh — Notice of New Fossil Mammals. 



Titanops curtus, gen. et sp. nov. 



This genus contains the largest members of the Bronto- 

 theridce, and some of the last survivors of the group. They 

 are distinguished from all the other known types, by the long, 

 narrow skulls, lofty, flat horn-cores, and short nasals. The 

 upper dentition corresponds nearly to that of Brontotherium, 

 but the upper molars have all two inner cones. 



Fig. 11. 



Skull of Titanops curtus, Marsh ; front view. One-eighth the 



Figure 11 shows the front view of the type specimen, which 

 indicates well the above features. The nasals are the shortest 

 known in the group. 



This specimen was obtained by the writer, in the lower 

 Miocene of Colorado. • 



Titanops elatus, sp. nov. 



A second specimen, about equal to the last in size, but repre- 

 senting a different species, is shown in figure 12. The nasals 

 are much longer, and the occipital crest much higher, than in 

 the type species. The zygomatic arches are unfortunately 

 wanting, but the lower jaw is present, nearly in place. It 

 shows no marked characters different from that of Brontojps. 



This specimen is from the Miocene of Dakota, and for 

 important aid in securing it, the writer is indebted to Prof. 

 F. R. Carpenter of the Dakota School of Mines. 



