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University of California Publications. 



[Geology 



AUomys cavatus (Cope). 

 Allomys lioloplvus (Cope). 

 Steneofiber peninsulatus Cope. 

 Steneoftber gradatus Cope. 

 Peromyscus nematodon (Cope). 

 Peromyscus parvus Sinclair. 

 Pleurolicus (?) sp. 

 Pleurolicus leptophrys Cope. 

 Entoptyclius planifrons Cope. 

 Entoptyclius minor Cope. 

 Entoptychus cavifrons Cope. 

 Entoptychus crassiramis Cope. 

 Entoptyclius lambdoideus Cope. 

 Lepus ennisianus Cope. 

 Rhinoceros, species indet. 

 Mesohippus equiceps (Cope). 

 Elothcrium sp. 



Thinohyus (Bothrolabis) osmonti Sinclair. 

 Thinohyus (Bothrolabis) decedens Cope. 

 Thinohyus (Bothrolabis) pristinus Cope. 

 Thinohyus (Bothrolabis) rostratus Cope. 

 Thinohyus lentus (?) Marsh. 

 Agrioclwenis guyotianus Cope. 

 Agriochoerus sp. 

 Eporeodon occidentalis Marsh. 

 Eporeodon occidentalis paciflcus (Cope). 

 Eporeodon occidentalis leptacanthus (Cope). 

 Allomeryx planiceps Sinclair. 

 Hypertragulus sp. 

 Stylemys sp. 



The Middle John Day is characterized by abundant remains 

 of Eporeodon, especially of the two smaller species occidentalis 

 and pacific us. and by a great number of rodents, which have 

 been obtained principally at two horizons, one at about the 

 middle and the other at the top of the Diceratherium beds. Both 

 horizons contain practically the same fauna. Next to Eporeodon 

 in abundance the most common form is a Hypertragulus, frag- 

 mentary specimens of which occur at almost every exposure. 

 Rhinoceros material is fairly abundant but usually fragmentary 

 and possibly represents other genera in addition to Diceratherium. 

 The smaller pigs of the genus Thinohyus are most common in 

 the middle beds, but it can not yet be determined whether they 

 are confined to this horizon. 



The Fauna of the Tipper Division. — The following are typical 



