Cope.] lbo [Dec. 16, 



gulum at the middle of its length. The anterior first cingulum extends 

 to the anterior external part of the crown, and then turns downwards and 

 posteriorly and terminates at the middle ot the external base. The 

 posterior crest is not transverse, but quite oblique, sloping at an angle of 

 45° with the axis of the jaw. The part of the crest which represents the 

 posterior V is a good deal larger than the part representing the anterior 

 V, and is closely joined with it. The latter is well separated from the 

 anterior first cingular ridge and its anterior exterior elevated portion. The 

 enamel of this tooth is finely wrinkled, and is more readily worn smooth 

 than in the Manteodon subquadratus. 



The penultimate superior molar has the posterior V well developed, 

 and its posterior basal or external angle is marked . by a tubercle homol- 

 ogous with that which is so prominent on the last molar. The anterior 

 V is a conic tubercle closely joined with the posterior V, and well separated 

 from the anterior first cingular lobe. The basal cingular are well developed, 

 but do not meet on the inner base of the crown. The first or superior 

 cingula meet as usual in an interior angle, but there is a contraction of the 

 anterior crest just before reaching this angle. The first true molar is 

 smaller than the second and has the same general structure. Here, how- 

 ever, the anterior first cingulum is more prominent near the internal angle 

 than the posterior. The characters of the premolars do not differ from 

 the corresponding ones of species of Coryphodon. The enamel is delicately 

 wrinkled. The first superior premolar is not preserved. 



Measurements. M. 



^ anteroposterior 034 



Diameters of crown of M. Ill 1 transverse 043 



' vertical 015 



r anteroposterior 028 



Diameters M. I ) transverse 033 



( vertical. 012 



TTT c anteroposterior 023 



Diameters P-m. Ill ? . non 



I transverse. 060 



It is probable that this species was about the size of an ox. 



CORYPHODON ANAX, Sp. nOV. 



Mr. Wortman sends me a number of teeth of probably two individuals, 

 which exceed in size those of any species of Ooryphodon yet known, and 

 differ in certain details of form from all of them. The specimens consist 

 of incisors, premolars and molars of both jaws of one animal, and an in- 

 terior canine, which from its separate wrapping, I suppose to have been 

 derived from a different locality. 



The incisors and premolars have the form usual in species of the genus, 

 differing only in their large size. The same may be said of the premolars. 

 A well preserved superior true molar is probably the third. It has the 

 form usual in the genus, but exhibits two peculiarities. The posterior 

 transverse crest is divided more deeply than usual by a deep notch which 



