560 



TITAJSrOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



was formerly (Osborn, 1896.110, p. 181, fig. 5) errone- 

 ously described and figured as pertaining to Menodus 

 trigonoceras. It exhibits the convex lower border, the 

 small mental foramen below the fang of ps, the absence 

 of external and internal cingula upon the inferior 

 molar-premolar series, the reduced first lower pre- 



Brontotherium? rumelicum (Toula) 



(Menodus? rumelicus Toula, 1892) 



Text figures 193, 463, 464 



[For original description and type references see p. 230) 



Type locality and geologic horizon. — Lower Oligo- 

 cene(?) of eastern Rumelia, Balkan Peninsula, Europe. 



Figure 463. — Two lower molars and symphyseal region of Brontoiherium? rumelicum 

 Type, paratype, and referred specimen of "Menodusf rumelicus" Toula; geologic level, "Belvidereschotter"; locality, Eajali, northwest of Burgas, 

 eastern Rumelia (fide Toula). A, Type, third right lower molar, crown view. Bi, B2, Paratype, second right lower molar (probably of another 

 animal), external and internal views. Ci, C2, Referred specimen, symphyseal region (probably of another animal), external and inferior views. 

 One-half natural size. The type offers no very distinctive generic characters, but the referred symphyseal region agrees nearly with BroTitotheTium 

 in general contour and in the proportions and position of the premolars. These specimens, together with the fragment named Titanotherium 

 bohemkum and the type lower jaw of BracJiydiasiematherium transilvankum, are the sole known European representatives of the titanotheres. 



molar, the short, obtuse canines, with a postero- 

 internal cingulum, the well-developed pair of lower 

 incisors, the crenulate crest of the hypoconulid on 

 ma, all characteristic of Brontotherium. The chin 

 is a little more decided than in B. gigas; the ui- 

 cisors are not evenly rounded but have a posterior 

 cingulum. 



Generic and specific characters. — -Symphyseal region 

 and premolars of paratype approaching Brontotherium 

 leidyi in characters and measurements. Premolars 

 with reduced external cingula. Symphysis massive, 

 flattened below. 



The second (paratype) and third lower molars seem 

 to offer no decisive specific characters. 



