DISCOVERY OF THE TITANOTHERES AND ORIGINAL DESCRIPTIONS 



179 



should read: "Second superior molar, antei'oposterior, 

 12 millimeters; transverse, 17 millimeters." 



Etymology. — primaevus, earliest in age; in allusion to 

 the supposedly low geologic horizon. 



Present determination. — Provisionally recognized as 

 a valid species. 



Mus. Nat. Hist. Bull., vol. 24, pp. 600, 601, 1908 

 (Osborn, 1908.318). 



Type species. — Palaeosyops horealis Cope. 



Generic characters (Osborn, 1908.318, p. 601). — 

 Superior molars subquadrate and rounded in form; 

 conules reduced, sublophoid; m'-m^ 63 millimeters 



Figure 113. — Cotypes of Manteoceras manteoceras {Telmalotheriam vallidens) 



After Osborn. Ai, Composite Am. Mus. 1569, 1570; side view otslsull; As, Am. Mus. 1669 (lectotype), superior view ot slcull; B, Am. 

 Mus. 1570, superior view of slcull. All one-fourth natural size. 



Eotitanops Ogborn, 1907 



Cf. Eotitanops Osborn, this monograph, page 289 



Original reference. — Am. Mus. Nat. Hist. Bull., vol. 

 23, p. 242, 1907; type species designated (Osborn 

 1907.294). 



Subsequent reference. — Osborn, New or little-known 

 titanotheres from the Eocene and Oligocene: Am. 



(estimated). Inferior molars without metastylids. 

 Hypoconulid of m' subconic. Fii'st inferior premolar 

 present. Manus tetradactyl, functionally tridactyl 

 with a tendency to mesaxonic structure. From Wind 

 River formation. 



Etymology. — ^cbs, dawn; Tltclv, a titan; w^, face — ■ 

 that is, first of the titanotheres. 



Present determination. — This genus is valid. (See 

 p. 289.) 



