428 TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



Measurements of Metarhinus fiuviatilis, M. cristatus, M. earlei, and RhadinorJiinus diploconus, in millimeters 



Am. Mus. 

 1600 (type), 

 Uinta B 1 



Am. Mus. 



1946, Uinta 



B2 



M. cristatus, 

 Field Mus. 

 12194 (type) 



M. earlei, 



Am. Mus. 



13166 (type), 



Washakie B 1 



Am. Mus. 



2055, Uinta 



B2 



Am. Mus. 

 1863 (type), 

 Uinta B 2 



Pi-m3 



p2-m3 



Mi-s 



P^, anteroposterior 



P*, transverse 



Transverse condyles.. 



Pmx to condyles 



Transverse zygomata. 



145 



132 



85 



18 



23 



140 

 131 



84 



92 



23 



»385 

 240 



167 

 156 

 102 

 -21 

 26 

 °76 

 393 

 240 



19 



168 



156 



103 



20 



26 



"76 



'' 440 



* Specimen crushed. 



This table shows the marked inferiority in size of 

 M. fiuviatilis as compared with E. diploconus and 

 M. earlei, as well as the close agreement in most 



measurements between M. earlei and the type of E. 

 diploconus. M. cristatus is intermediate in size between 

 M. fiuviatilis and M. earlei. 



Measurements of species of Metarhinus, in millimeters 



M. fiuviatilis, 

 Am. Mus. 

 1500 (type) 



M. riparius 



Field Mus. 

 12186 (type) 



M. cristatus. 



Field Mus. 



12194 



Am. Mus. 

 13166 i.type) 



Skull 



Length, incisors to condyles 



Breadtli across arches 



Breadth between orbits 



Postorbital process to condyles 



Last molar to condyles 



Length of free nasals 



Greatest breadth of nasals 



Postglenoids to condyles (median line) . 



Breadth across condyles 



Greatest depth of arch 



Length of molar-premolar series 



Length of molar series 



Length of crown of canine 



Diameter of crown of canine 



Length of diastema 



Narrowest point in sagittal area 



Breadth of orbitonasal area 



352 

 205 

 112 



214 



107 



39 



406 

 >> 210 

 <> 114 



205 



189 

 »128 

 68 

 87 

 79 

 55 



160 

 93 

 24 

 18 

 11 

 10 

 41 



406 



220 



107 



212 



193 



115 



68 



89 



82 



51 



155 



93 



29 



20 



10 



385 

 240 

 145 

 215 

 195 



390 

 237 

 137 

 198 

 182 



388 

 245 

 142 



405 

 255 

 220 

 220 



90 



75 



92 



169 

 104 



Mandible 



Length, condyles to incisors 



Height, condyles above angle 



Length of molar-premolar series . 



Length of molar series 



Length of crown of canine 



Diameter of crown of canine 



Depth of ramus from base of ps- 

 Depth of ramus from base of ms. 



338 



133 



172 



110 



34 



21 



52 



39 



330 



125 



162 



102 



» 32 



19 



49 



60 



184 



120 



74 



73 



79 



50 



158 



100 



29 



15 



42 



130 



170 

 103 

 30 

 16 

 11 

 17 

 50 



330 

 157 

 171 

 107 



"315 

 135 

 168 

 110 



340 

 148 

 170 

 105 



' Specimen distorted. 



