CEEODONTA. 267 



convex, descending again to the angle. The condyle is not very wide, 

 presents upwards, and is on a line one-third way above the molars in the 

 line to the summit of the coronoid process. The coronoid process is both 

 high and wide at the base, there being no emargination between it and the 

 condyle. The masseteric fossa has a distinct border anteriorly, which rises 

 nearly to the summit of the coronoid process, and turns posteriorly to its 

 posterior margin. Below, it fades out to the general surface. The inferior 

 border at the angle is not inflected. An inferior pterygoid fossa of the 

 inner surface has a marked superior boundary extending horizontally a 

 little below the tooth line. A lower ridge extends downwards and back- 

 wards parallel with the inferiorly decurved border of the jaw. 



Measurements. 



M. 



Length of skull to posttyrapanio region 054 



Length of skull to orbit 031 



Length of skull to end of molar series 032 



Length from I. 1 to canine 0065 



Length from canine to end of molars 0220 



Length of premolar series : 0148 



Elevation of crown of canine 0040 



Length of base of Pm. iii 0045 



_. ^ . ,^. i , (anteroposterior 0040 



Diameters ot penultimate molar < , „.,_ 



{ transverse UU4o 



Length of mandibular ramus from Pm. 1 to condyle 0425 



Elevation of coronoid process from inferior border 0200 



Width of coronoid process at condyle 01 10 



Length of inferior molars 0235 



Length of inferior true molars 0095 



Depth of ramus at second true molar 0070 



Depth of ramus at canine 0035 



This species is smaller than any of the known Stypolophi, and is about 

 equal to the Ictops dakotensis. Besides the characters already mentioned, 

 the two-lobed external wall of the superior fourth premolar will readily 

 distinguish it from any of the species of the former genus. 



