104 



CEXOZOIC MAMMAL. HORIZONS 



LOWER OLIGOCENE— Continued. 



RODEXTIA— Continued. 



ISCHTROMTID^. 



Ischyromys veterior Matthew. 

 Gyninoptychus (=Adjidaumo) 



"minutus (Douglass) 



Gymnoptychus (=Adiidamno) 



minimus Matthew 



Leporid^. 



PalseolagustemnodonDouglass. 

 Palseolagus brachyodon Mat- I 

 thew 



PERIS SOD ACTYLA. | 



Hyracodoktid^. j 



Hyracodon priscidens Lambe. . .' 

 Hyracodon sp ! 



A M YNODOXTID^ . 



Metamynodon sp 



Rhln'ocerotid.e, 



Trigonias osborni X 



Trigonias sp X j 



I.eptaeeratherium trigonodum. X | 

 Csenopus (=SubhTracodon) sp. I ' 



div X 



Caenopus cf. platvcephalus O. ! 



and W ' X 



Caenopus mitis Cope X 



LOPHIODOXTIDJE. 



Colodon (=Mesotapirus) occi- 

 dentalis Leidv 



Mesohippus 



born 



Mesohippus 

 Mesohippus 

 Mesohippus 



born. .". . . 

 Mesohippus 

 Mesohippus: 

 Mesohippus 

 Mesohippus 

 Mesohippus 

 :M e s 0 h i p 



Lambe. . . 

 Mesohippus 



bom 



brachvstvlus Oa- 



? Chalicotheriid^. 



■ Chalicotherivim 

 Cope a 



bilobatum 



TlTANOTHERIID^ (=BR0XT0- 

 THERIIDiE). 



Titanotherium prouti Leidy 



Tltanotherium helooerus (Coi)e) 

 Titanotherium trigonoeeras 



(Cope 



Titanotherium ingens (Marsh) . 

 Megaceropscoloradensis (Leidy) 



Megacerops dispar (Marsh) 



Megacerops angustigenis Cope. . 

 Megacerops selwynianus (Cope) . 

 Megacerops tiehoceras (S. and 



O.) 



Megacerops robustus (Marsh) . . 

 Megacerops brachycephalus Os- 



bom 



proteulophus Os- | 



' X 



hypostylus ' X 



celer Marsh X 



montanensis Os- j 



latidens Douglass..' 

 precocidens Lam be . 

 propinquus Lambe. 

 stenolophus Lambe | 

 planidens Lambe.. 

 pus assiniboiensis 



PERI S SOD ACTYLA- 



Continued. 



TIT.VXOTHERIIDJ ( = Broxto 

 THERIID.E) — continued. 



Megacerops marshi Osbom 



-UJops serotinus Marsh 



.Vllops crassicomis Marsh . . 



-Ulops amplus (Marsh* 



S\-mborodon torvus Cope. . . 

 S\Tnborodon acer Cope 



Brontotherium glgas Marsh. . . 

 Brontotherium curtum Marsh. 



(Os- 



Brontotherium ramosum 



bom) 



Brontotherium dolichoceras (S. 



and O.) 



Brontotherium platvceras (S. 



and O.) 



Brontotherium leidyi Osborn.. 

 Brontojtheri um hypoceras 

 (Cope 



Titanotheriidae indet . 



ARTIODACTYLA. 



ELOTHERUD^ (=E>rTELODOX- 

 TID^). 



Elotherium (=Entelodon) co- 

 arctatum Cope 



Elotherium (=Enteiodon) 

 crassirm Marsh 



Elotherium (=Entelodon; sp. 

 div 



D1COTYLID.E (= 

 Perchcems sp. . 



Tagassuid^). 



Leptochcerid^. 

 Stibams montanus Matthew. . 



AXTHRACOTHERIID-E. 



Hyopotamus (=Ancodon) 



americanus Leidy 



? Anthracotherium sp. 



Oreodoxtidje (=Agriochce- 

 Bathygenys alpha Douglass... 



Oreodon (=Merycoidodon) hy- 

 bridus Leidy .'. 



Oreodon (=Merycoidodon) af- 

 finis Leidy 



Oreodon (=Merycoidodon) bul- 

 latus Leidy 



Agriochoerus maximus Doug- 

 lass 



Agriochoerus minimus Doug- 

 lass 



Agriochoems sp 



H YPERTBAGl."XID.f: . 



Trigenicus socialis Douglass 



? Trigenicus mamraiier Cope 



! Leptomeryx esulcatus Cope 



Leptomeryx sp. div 



Heteromei-yx dispar Matthew. . 

 ? Heteromervx tr a n s V e r s u s 

 I (Cope I...." 



CAMELID.E. 



! ?Leptotragulus profectus Mat- 

 : thew 



a Generic reference incorrect; family reference very questionable. 



1. 



2. 





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