Eaton — John Day F el idee in Marsh Collect ion. 439 



with total loss of P 2 ; either condition would denote 

 a variation from the more complete dentition of 

 Nimravus. 



P 3 is a large tooth, its principal cusp being sub-equal 

 in size to the paracone of P 4 , as in Nimravus debilis. 

 From the last named species it differs in having a slightly 

 greater transverse diameter of the crown relative to the. 

 antero-posterior diameter, and the inner division of the 



Fig. 5. — DincElurus crassus, gen. et sp. nov. Holotype. X %• 



posterior root is much stouter, a condition that suggests 

 further advance toward Pseudcelurus and Fells. P 4 

 exhibits less development of the inner root than I have 

 observed in any specimens of Nimravus, and the inner 

 root does not support a positive protocone. There is 

 less trace of a parastyle than in Nimravus, and the 

 external outline of the crown is slightly convex instead 

 of being slightly concave as is usually the case in 

 Nimravus. This convexity of crown gives the tooth an 



appearance of 



greater 



breadth, if the buttress formed 



