98 



CENOZOIC MAMMAL HOKIZONS 



MIDDLE EOCENE— Continued. 

 PERIS 8 OI> ACT YL A— Continued. 



LOPHIODONTID-E. 

 1. 2. 



Helaletes boops Marsh. . 

 Helaletes nanus (I/eidy) . 

 Helaletes sp. div 



Helaletes sp. div 



Desmatotherium guyoti Scott. 

 Dilophodon minusculus Scott. 



1. 2, 



? Isectolophns modestus (Leidy), 



Orohippus pumilus (Marsh) . . . 

 Orohippus ballardi (Marsh) . . . 

 Orohippus procyoninus (Cope) 



Orohippus major Marsh 



Orohippus cinctus (Cope) 



Orohippus oshornianus (Cope) . 



TAPIRIDiE. 



X I II Isectolophns latidens (S. and O.). 



EQUID.ai. 



Orohippus sylvaticus (Leidy) 



Orohippus a^ilis Marsh 



Orohippus uintanus (Marsh) . 



X 





X 





X 





X 





X 





X 





TlTANOTHERIIDiE ( = BRONTOTHERIID^).a 



Palseosyops paludosus Leidy. 



Palaeosyops major Leidy 



Palaeosyops fontinahs Cope., 

 lyimnohyops laticeps Marsh.. 

 Palseosyopinae sp. div 



Palaeosyops humilis Leidy 



Palaeosyops robustus Marsh 



Limnohyops diaconus Cope 



Telmatherium validum Marsh 



Telmatherium cultridens S. and O . . . 

 Telmatherium hyognathum S. and O. 



Telmatherium niegarhinuna Earle 



Telmatherium vallidens (Cope) 



Manteoceras manteoceras (Osborn) . . 

 Palaeosyopinae sp. div 



ARTIODACTYLA. 



HOMACODONTIDiE ( = DlCnOBUNID/E).6 



Homacodon sp. aff . vagans . . 

 Microsus ciispidatus Leidy. . . 

 Sarcolemur pygmaeus (Cope) . 

 Sarcoiemur furcatus Cope. . . 

 Nanomeryx caudatus Marsh. 



Helohyus pHcodon Marsh 



Helohyus sp. div 



X 





X 





X 





X 





? 





X 





X 





Homacodon vagans Marsh 



?Stenacodon rarus Marsh 



Helohyus lentus (Marsh) 



Helohyus validus (Marsh) 



Helohyus sp. div 



? Ithygrammodon cameloides O., S. 

 S. : 



and 



UPPER EOCENE. 



First phase. Second phase— True Uinta 



Eohasileus zone. Diplacodon zone. 



Washakie Basin, Wyoming (upper beds). 1. Uinta Basin, Utah (horizon C). 



Uinta Basin, Utah (horizons A and B). 

 ? Sage Creek, Montana. 



? Uppermost Bridger (horizon E), Wyoming, 



PRIMATES. 

 NOTHARCTID^. 





1. 



2. 



3. 



4. 



Notharctus uintensis (Osborn) . . 





X 





? 



CARNIVORA (CREODONTA). 



MlACID^. 



Miacis uintensis Osborn. 



I X I 



X 





X 





X 





X 





X 





X 



X 



X 



X 



X 



X 



Oxyaenodon dysodus Matthew 

 Thinocyon sp. indesc • 



Harpagolestes uintensis (S. and 











0.) 





X 







Harpagolestes sp. indesc 



X 













X 







Miacis vulpinus S. and O | X 



Miacis umtensis Osborn I X 



?T;intacyon scotti (W. and M.) j ? 



OXY^NID^. 



I 11 Oxyaenodon dysclerus Hay I X 



I II Limnocy on sp. indesc | X 



Mesonychidje. 



Harpagolestes uintensis (S. and O.) i ? 



n The Eocene titanothcres will be revised and the list of genera and species considerably extended in 

 Professor Osborn's forthcoming monograph on the family. 



b See Stehlin, Saugethiere des schweizerischen Eocans, IV. Th.. Abhandl. Schw. pal. Ges., vol. 23, 

 1906, p. 669, for inclusion of Homacodon and related genera in the Dichobunidae. The reference of Micro- 

 sus and l^arcolemur to t-iis group is based on comparison with Homacodon, 



