300 



TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



Figure 255. — Cross sections of the skull in middle Eocene titanotheres 



One-fourth natural size. Ai-Ei, Sections across the face just behind the lacrimal and through the malar and m'; A2-E!, sections 

 across parietals, alisphenoids, and zygomatic process ol squamosal. Ai, Aj, Palaeosyops leidyi, Am. Mus. 1516; Bi, Ba, 

 Telmathermm ultimum, Am. Mus. 2060 (type; crushed laterally); Ci, Cj, Manteoceras manteoceras, Am. Mus. 12678; Di, Ds, 

 Mesatirhinus pclersoni, formerly Am. Mus. 1566, now in British Museum; Ei, Ej, Bolkhorhinus hyognathus, Am. Mus. 1851. 



