122 Annals of the Carnegie Museum. 



Fig. 13 of Plate II in Leidy's " Extinct Vertebrate Fauna of the 

 Bridger Tertiary Formation of Wyoming Territory" represents Hy- 

 rachyus modestiis, ^hxch. seems somewhat similar to Parisectolophus, and 

 possibly may belong to this genus. However, the metacone appears 

 to be located on a more direct antero-posterior line with the paracone, 

 and the junction of the metaloph with the ectoloph is somewhat 

 further forward than in the type of Parisectolophus described and 

 figured. 



Genus Schizolophodon gen. nov. 

 38. Schizolophodon cuspidens sp. nov. (Plate XLIV, Fig. 4). 



Type: A pair of lower jaws with premolars and molars fairly well 

 preserved. C. M. No. 3045. 



Paratype: Right lower jaw and symphysis with roots of canines 

 and the anterior cheek-teeth of the right ramus, C. INI. No. 3010. 



Horizon: Uinta Eocene, Horizon C. 



Locality: Duchesne River, Six miles East of Myton, Utah. 



Principal Characters: Lower molars with incomplete cross-crests, 

 especially on M-^ and the anterior cross-crest of M^- Hypoconulid of 

 M-^ comparatively small. Animals about the same size as Isectolophus 

 annectens. 



Detailed Description of the Material: The horizontal ramus is heavy 

 and quite deep; the symphysis is heavy, but the rami are not con- 

 stricted back of the canine, and there are two or more mental foramina, 

 of which the most anterior is directly below Py. The vertical ramus is 

 not present in either type or paratype. 



The incisors, of which there appear to be three on either side, are 

 only represented by roots and are rather small. 



The canines are also broken off, and are proportionally small^"^ 

 when compared with those in Parisectolophus latidens from the Bridger. 

 There is no diastema between the canine and the cheek-teeth. Py has 

 a single fang and a simple crown with a small basal shelf postero- 

 intcrnally. P2- is quite suddenly enlarged, especially in the fore-and- 

 aft direction. The anterior portion of the crown consists of a blunt 

 trihedral elevation with the apex directed forward, while the posterior 

 portion (the heel) is low, partly due to wear, the tetartoconid being 

 absent. P..- is considerably farther advanced towards the molar pat- 



'"' In the paratype the canines are apparently of larger size. 



