1877.J 5<->5 [Cope. 



Elevation of external cusp. 065 



" internal " 055 



Length between apices of external cusps 043 



The molar tooth described exceeds in transverse dimensions that of the 

 Mastodon oMoticus, and evidently belonged to one of the most colossal of 

 land animals. Its generic posit ion is near to Mastodon and Binotherium, but 

 if the tooth on which my observations are based be complete, it is distinct 

 from either. The possession of only two transverse crests separates it . 

 from the former, and would, were the tooth an anterior molar, refer it to 

 the latter. As it appears to be a posterior molar, this view of its affinity 

 becomes untenable, and I therefore establish for it a new genus, under the 

 name Cjenobasiletjs. The tooth described resembles that of the genus 

 Tapirus, but differs in the absence of the external trihedral enlargement 

 of the cross crests seen in the superior molars of the former, and also in 

 the tubercular and fissured character of the crests proper. The species 

 may be called C. tremontigerus. 



The typical specimen was probably obtained in Texas, but I am not yet 

 informed as to the precise locality. 



Issued March 19, 1877. 



