DINOCERATA. 



341 



In Prof. Marsh's words " The superior canines are long, 

 decurved, trenchant tusks. They are covered with enamel, 

 and their fangs extend upwards into the base of the maxil- 

 lary horn-core. There is some evidence that these tusks 

 were smaller in the females. Behind the canines there is a 

 moderate diastema. The molar teeth are very small. The 

 crowns of the superior molars are formed of two transverse 

 crests, separated externally, and meeting at their inner 

 extremity. The first true molar is smaller in this specimen 

 than the two preceding premolars. The last upper molar is 

 much the largest of the series. 



" The lower jaw in Dinoceras is as remarkable as the skull. 



FIG. 146 



Its most peculiar features are the posterior direction of the 

 0) Upper and lower jaws of Dinoceras (Marsh). 



