164 



TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



"No. 1," the Bridger specimen (Am. Mus. 5104), as 

 the lectotype. 



Characters.- — Cope writes: 



This species is one of the larger forms of the group originally 

 represented by Palaeosyops, and which has turned out to be so 

 numerous in species. [This statement refers apparently to 

 "No. 2."] 



The anterior median small tubercle of the first true molar is 

 wanting. The last true molar has but one interior cone. [All 

 these statements apply evidently to " No. 1," the Bridger or Cot- 

 tonwood Creek specimen.] 



The canine tooth is powerful and bearhke; the outer incisor 

 is the largest. The premaxillary bones are short, and the side 

 of the face elevated and plane to the convex nasal bones. Zygo- 

 matic arch massive. 



Am. Mus. 5107. 



Figure 97.— 



After Cope, 1885. Ai, 

 natural 



A3 



-Cope's type (holotype) of Limnohyus fontinalis 



Young skull seen from above, one-half natural size: As, the same, right side, one-half 



size; A3, right maxilla with dp<, m', m', natural size. 



The molars have the general form of those of L. robustus, 

 but the second superior premolar has but one outer tubercle. 

 The cingula are much less developed than in that species, 

 those between the inner cones of the molars being entirely 

 absent. These cones are low and, with the rest of the crowns 

 of all the teeth, covered with smooth and shining enamel. 



Measurements [Cope, condensed and corrected] 



IVtillimeters 



Length of molar series (No. 1) 141 



Length of true molars 84 



Length of crown canine (anteroposterior) 20 



Length of crown last molar (anteroposterior) 30 



Width of crown last molar (transverse) 34 



