TALIGEADA. 605 



of the third premolar. The posterior border of the palate is a little concave 

 near the internal extremity of the last molar, and then curves posteriorly. 

 The median portion is lost. 



The mandibular rami are partly preserved, together with the part of 

 the symphysis between the canine teeth. The symphysis is coossified, has 

 a nearlv vertical direction, and is flat transversely in front. The rami are 

 compressed, and somewhat thickened below. The inferior outline is con- 

 cave below the coronoid process (which is lost), and the angle is very 

 prominent. It is broadly rounded in profile, and extends a considerable 

 distance posterior to the base of the condylar process. Its external border 

 is somewhat revolute; the infei'ior border is very slightly incurved. The 

 masseteric fossa has an anterior border, and is marked off from the angle 

 posteriorly, Init it fades out below. 



The parieto-squamosal suture is rather elevated in position above the 

 base of the zygoma, but descends posteriorly to reach the occipital below 

 the mastoid foramen. The nasal bones encroach considerably on the 

 frontals posteriorly, reaching to opposite the postorbital angle. In this this 

 animal resembles some of the species of Phenacodus. The nasal, naso- 

 maxillary, and maxillo-premaxillary sutures are distinct and even. 



There are two post-squamosal foramina, and five postparietal, with two 

 or three on the squamoso-parietal suture. The condylar foramen is distinct 

 from the foramen lacerum posterius. It is probable that there is a postgle- 

 noid foramen. The relations of tlie foramen ovale are not certain. There 

 are several small foramina in the front of the symphysis. 



The superior true molars only ai'e preserved with parts of the alveoli 

 for the fourth premolar. The first and second molars are similar, but the 

 second external V of the third is much reduced, owing to the oblique 

 tiimcation of the postero-external side of the crown. It is broken off" in the 

 specimen. The external Vs of the first and second molars are much flat- 

 tened inwards, and have slightly concave external faces. There is no ridge 

 or tubercle, but a weak angle only, to distinguish their external planes. 

 The anterior is a little lai-ger than the posterior, on account of the exten- 

 sion of the anterior external angle. The latter has a slight anterior hook 

 or recurvature. The internal V is rather acute, and is a little anterior to a 



