188 



TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



The inner cusps (deuterocones) are low with rounded summits. 

 They are more nearly opposite the postero-external than the 

 antero-external cusi5. There are inner cingula on p' and p*. 

 The antero-internal cusp in m^ is quite high and m' conical. 

 The postero-internal cusp is due simply to an increase in height 

 of the cingulum. 



Measurements 



Millimeters 



Total length of top of skull 500 



From anterior orbit to front of nasals 160 



Width of occiput 128 



Height of occiput 140 



Length of molar-premolar series 190 



Length of premolar series 75 



Length of molar series 115 



Length of p2 20 



Width of p2 16 



Dolichorhinus longiceps Douglass, 1909 



Cf. Dolichorhinus longiceps Douglass, this monograph, page 406 

 Original reference. — Carnegie Mus. Annals, vol. 6, 



No. 2, pp. 312-313, text fig. 8; pi. 13, fig. 2; pis. 14, 



15, 1909; "issued November 6, 1909" (Douglass, 



1909.1). 



Type locality and geologic horizon. — Uinta Basin, 



Utah, "about 1^ miles east of well No. 2," from 



Figure 133. — Type (holotype) skull of Dolichorhinus heterodon 



Carnegie Mus. 2340. After Douglass, 1909. Ai, Palatal view; As, right lateral 

 view. One-fifth natural size. 



Millimeters 



Length of p3 21 



Width of p3 20 



Length of p< 24 



Width of p^ 27 



Length ofm' 34 



Width of ml 35 



Length ofm^ 46 



Width of m2 42 



Length ofm^ 48 



Width of m3 42 



Figure 134. — Type (holotype) of Dolichorhinus heterodon 



Upper premolar series. Carnegie Mus. 2340. After Douglass, 1909. Slightly less 

 than one-half natural size. 



"the lowest level at which fossils were 

 found in horizon 'B' of the Uinta, about 

 700 feet below the bottom of the Uinta 

 red beds (horizon 'C')." Eohasileus- 

 DolicJiorJiinus zone (Uinta B 2). 



Type. — A skull lacking the incisors, part 

 of the dentition, and the basioccipital 

 region (Carnegie Mus. 2347). (See figs. 

 135 and 136.) 



Specific characters. — Douglass writes: 



Phis skull in general outline is very much like 

 that of Dolichorhinus hyognathus, though broader. 

 In describing it I prefer to point out the char- 

 acters which distinguish it from that species. 

 Apparently it is somewhat broader proportionally 

 than that of D. hyognathus. The skull is some- 

 what crushed, but it evidently was not flattened 

 on top. The present specimen had no heavy 

 protuberances or horn cores, though there may 



Figure 135. — Type (holotype) skull of Dolichorhinus longiceps 

 Top view. Carnegie Mus. 2347. After Douglass, 1909. One-sixth natural size. 



Etymology. — crepos, difl^erent, or various; bbobs, tooth. 

 Allusion not clear; name possibly given because no 

 two teeth in the superior premolar-molar series are 

 alike. 



Present determination. — The form is closely allied 

 to D. intermedins, of which it may be the successor. 

 Its specific separateness is somewhat doubtful. 



have been the slightest beginning of such. There is a 

 rather narrow shelf, or lateral expansion of the malars, with 

 rounded outer borders, beneath the anterior portion of the 

 orbit, but it is not like the infraorbital process of D. hyognathus. 

 The postorbital hook does not appear to have been long or 

 prominent. Evidently the zygomatic arches extend laterally 

 outward more than in the last-named species; the postglenoid 

 processes are not nearly so heavy; the palate is broader; the 

 top of the cranium, though there is no zygomatic arch, becomes 

 narrower anterior to the crest of the occiput. 



