1881.] 1'^ [Cope. 



tooth is as peculiar as the posterior. The external cusp gives origin to 

 three crests, two of them the usual limbs of the anterior V ; while a third 

 descends to the anterior border a little exterior to its middle. It encloses 

 a deep groove with the anterior ridge of the anterior V. This arrangement 

 is not seen in any other species. 



The inferior canine is robust, and has its anterior angle prominent, but 

 not alate. The crowns of the inferior incisors are regularly convex ex- 

 teriorly, and have no cingula. They are regularly graded in dimensions. 



The superior molar preserved is probably the penultimate. Its 

 anterior portion Is broken. The posterior external V is narrower 

 than usual for a second molar, and resembles somewhat that of the 

 last superior molar of the Manteodon suhquadratus. A slight contact 

 face on the posterior cingulum shows that this tooth is not the last 

 molar. The said cingulum extends to the external base of the V ; in 

 rising to the internal cusp it forms a sigmoid curve. The cingulum 

 below this, on the inner base of the crown, is rudimental. The superior 

 canine has a long and robust crown, with a triangular section to the apex. 

 The posterior face is a little wider than the other two, which are equal. 

 The anterior is slightly concave in cross-section, and the posterior slightly 

 convex transversely, although concave longitudinall}^ There is a weak 

 ridge nearly parallel to and near the postero-external angle, and traces of 

 others on the postero-external face of the crown- in front of this one. The 

 antero-internai angle is swollen at the base. 



The superior incisors present characteristic features. The ridge of the 



external face, which is weakly developed in some of the species, and is 



wanting, in others, is here represented by a strong longitudinal angle, 



which extends from the base of the crown to its apex, dividing the 



external face into two distinct planes. This character is most marked on 



the external incisor, where the planes are sub-equal, and concave. On the 



second the anterior plane is smaller, and on the first it is a good deal 



smaller. These incisors have a weak internal cingulum, but no external one. 



Measurements. M. 



Length of ramus from P-M. IV inclusive 257 



" inferior true molars 098 



.^. ^-., T. ^ (anteroposterior 0275 



Diameters of M. I mier. ? , rvoA 



( transverse 020 



^. ,, ^^^ . „ (anteroposterior 036 



Diameters of M. Ill mfer. ? ^ „„,. 



\ transverse 039 



Depth of ramus at M. Ill 075 



^. „ ,, ^, (anteroposterior 0315 



Diameters of M. 11 super. > transverse 039 



f longitudinal . . . .094 

 Diameters of crown of superior canine < anteroposterior. .032 



' transverse 034 



^. , ^^ ... (vertical 022 



Diameters of crown of I. in 1 1,^^,^^,,, 034 



