348 



TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



male skull (Am. Mus. 2004), however, there is a low 

 swelling (PI. XVI) at the junction of the nasals, 

 maxillaries, and frontals, at a point above and some- 

 what in front of the anterior rim of the orbit, which 

 betokens the presence of a horn rudiment in an even 

 more incipient stage than that of M. manteoceras or 

 D. hyognathus . 



The uncrushed skull was evidently rather broad 

 between the orbits. The supratemporal crests are 

 moderately defined anteriorly, but as they enter the 



ing over of the downward lateral extension of the 

 nasals; (3) the wide interval (109 mm.) between the 

 antorbital border and the narial notch; (4) the anterior 

 extension of the malars below the orbit; (5) the clear 

 definition of the lacrimals, partly external to and 

 partly within the orbit; (6) the prominence of the 

 postorbital processes of the frontals and malars re- 

 spectively; (7) the gently rounded conformation of the 

 malar below the orbit, which most nearly resembles 

 that in T. cultridens; (8) the sharp downward or in- 



ap/iij^ 



Figure 296. — Type skull of Telamatherium ullimum 



One-fourth natural size. Am. Mus. 2060. White River, Uinta Basin, Utah; base of Uinta C, true Uinta formation. Ai, Palatal view; A2, top view. 

 Lateral crushing has narrowed the frontal region and distorted the zygomata. 



parietals they become more sharply defined, leaving a 

 shallow groove between the summits of the short 

 sagittal crest. The superior border of the lateral 

 occipital crest is rather delicate ; in fact, the entire skull 

 is slender rather than broad and massive. 



The lateral aspect of the skull is distinguished by 

 the following characters: (1) The relatively short (85 

 mm.) free portion of the nasals; (2) the elevation of 

 the maxillaries on the sides of the face, somewhat as 

 in M. megarJiinus and D. hyognathus, and the cover- 



ferior flange of the malars beneath their junction with 

 the squamosals; (9) the moderate upward extension of 

 the zygomatic squamosal bar; (10) the presence of a 

 cranial depression at the point of junction between the 

 parietals and the frontals, or above the mid-cranial 

 region, the skull being gently arched upward in front 

 of this point. 



The anterior aspect of the skull (fig. 295) exhibits the 

 relatively deep premaxdlary symphysis as compared 

 with that of P. leidyi, and the absence of the extremely 



