CONDYLARTHEA. 423 



The symphysis mandibuli extends posteriorly to below the anterior 

 margin of the third premolar. The inferior border of the ramus is greatly 

 convex. The border of the masseteric fossa is only distinct on the anterior 

 edge of the coronoid process. There is a small meatal foramen below the 

 first premolai'. The infraorbital foramen is above the posterior part of the 

 third premolar. The malar bone does not extend anterior to the base of 

 the zygomatic process of the maxillary, excepting in a narrow prolongation 

 forming the external edge of the inferior border of the orbit. This pro- 

 longation rises on the anterior border of the orbit to a point considerably 

 above the line of the infraorbital foramen. 



Measurements. 



No. 1 {superior molars). 



M. 



Leugth of bases of last five superior molars 026 



Length of superior true molars 014 



Diameters of p.m. iii J *"*<'™l«'«t«'i°'^ 0065 



( transverse 007 



Diameters of P-m.iv^''"t"''P''«t''"°'' 0055 



c transverse 008 



Diameters M. i^'^°*''^°P°«*«'"'''' ' 005 



( transverse 0086 



Diameters M.iii J ^■^t*''°P'"**°"°' 0035 



c transverse 008 



No. 2 (both jaw$). 



M. 



Length of last tive superior molars 0275 



Length of superior true molars 014 



Length of last five inferior molars 029 



Length of inferior true molars 0155 



Diameters M.i^^"**^''?"^*^"'"^ ■ 0055 



t transverse 045 



Measurements M.iii^'»«*^'-°P°^'«"°' 0055 



transverse 0038 



Depth of ramus at M. ii 0146 



No 3 (Inferior Molars). 



M. 



Length of inferior molar series 0410 



Length of inferior true molars 0175 



Length of base of P-m. ii 0054 



Length of base of P-m. iii 0068 



Width of base of P-m. iii 0050 



Length of b.ase of P-m. Iv 0068 



Width of base of P-m. iv 0050 



This species has only been found as yet in the lower part of the Puerco 

 formation, by Mr. Baldwin; as the S. lineatus has been only obtained from 

 the upper Puerco. 



