Vol. 5 J 



Merriam. — John Day Camivora. 



37 



P 4 , transverse diameter 



M 1; anteroposterior diameter 



M 1( transverse diameter of trigonid 



M], antero-posterior diameter of heel 



M 1( transverse diameter of heel 



M 2) antero-posterior diameter 



M 2 , transverse diameter .-. 



M 3 , antero-posterior diameter 



Height of inion above foramen magnum 



Greatest width across occipital condyles 



Height of foramen magnum 



Greatest antero-posterior diameter of otic bulla 

 Greatest transverse diameter of otic bulla 



a 



6.5 

 18.0 

 7.8 



33 



34.5 



12 



28.5 



19 



5 



7.1 



8 



5.4 



a. Approximate. 



FELIDAE. 



Though fairly well known from skulls and teeth, the John 

 Day eats have, as a whole, presented some of the most puzzling 

 features of this fauna. The most common and best known forms 

 included in the genera Archaelurus and Nimravus have been gen- 

 erally considered as representing the most primitive division of 

 the machaerodont "roup of the Felidae. In the White River 

 beds, held to be older than the John Day, there appeared to be 

 among the felines no forms so primitive as these. As the other 

 elements of the John Day fauna are nearly all more advanced 

 than the corresponding forms of the White River, the evidence 

 regarding the age of the beds which is furnished by these cats 

 seemed to contradict that of the remainder of the fauna. 



Much yet remains to be learned concerning the John Day cats, 

 as in most eases but little excepting the skull and dentition has 

 been discovered. 



No representatives of the Felidae have been described from 

 the Mascall beds. 



The following species are known from the John Day series: — - 



Archaelurus debilis Cope. 



Nimravus gomphodus Cope. 



Nimravus confertus Cope. 



Deinictis cycloids Cope. 



Pogonodon platycopis Cope. 



Pogonodon brachyops Cope. 



Pogonodon davisi, n. sp. 



Eoplophoneus cercbralis Cope. 



Eoplophoneus strigidens Cope (?). 



