408 



TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



Figure 343. — Skulls of Dolichorhinus 



From White River, Uinta Basin, Utah, level Uinta B 2. One-fourth natural size. A, D. iniermedius, Am. Mus. 1837 (type), reversed; B, 

 D. heterodon, Carnegie Mus. 2340 (type), reversed; C, D, longkeps, Carnegie Mus. 2347 (type), "from the lowest level at which fossils 

 were found in horizon B" (Uinta B 2). 



Measurements of Dolichorhinus heterodon, D. longiceps, and D. 

 hyognathus, in millimeters 



Pmx-condyles 



Transverse zygomata 



Mi-m' 



P^ ap. by tr 



M', ap. by tr 



M2, ap. by tr 



M3, ap. by tr 



D. hetero- 

 don, 

 Carnegie 

 Mus. 2340 

 (type) 



487 

 240 

 114 

 22X25 

 33X32 

 42X41 

 39X38 



"485 

 «225 

 119 

 21X26 

 32X33 

 42X42 

 42X42 



Carnegie 



Mus. 2347 



(type) 



"555 

 »264 

 115 

 21X29 

 35X ? 

 39X40 

 39X ? 



D. hyogna- 

 thus. Am. 

 Mus. 1851 



(type of 

 Telmato- 



therium 

 cornutnm) 



550 

 -240 



122 

 23X27 

 34X34 

 43X43 

 45X ? 



Additional observations on Dolichorhinus longiceps. — 

 A skull in the Carnegie Museum (No. 2865) referred 

 by Mr. Peterson to D. longiceps is associated with a 

 complete fore limb and other parts of the skeleton. 

 It was found at a low level in Uinta B 1. It differs 

 from the type of D. heterodon in having a larger m^; 

 it appears to be smaller than the type of D. longiceps 

 in skull dimensions but somewhat larger in the 

 second and third upper molars. 



Mr. Peterson's description (1914.3) of this skull, 

 with the mandible and hyoid bones, is in substance as 

 follows : 



The specimen (No. 2865) consists of the greater portion of 

 the skull, the posterior part of the mandible of the left and frag- 

 ments of the right side, the hyoid arch, the cervical vertebrae, 

 two dorsal and two lumbar vetebrae, together with the fore 

 limb and foot practically complete. 



