94 SIMIID^. 



The skull is chiefly distinguished by its rotundity, due to the outward bulging 

 of the zygomatic arches ; by the contraction of the muzzle at its base ; by the 

 concavity below the orbits ; by the anterior expansion of the muzzle ; by its rather 

 round than vertically elongated posterior nares ; by the great development of the 

 orbital ridges ; by the expanded frontal depression behind them ; and, lastly, by its 

 relatively rather small molars and premolars. 



The vertebral formula is C. 7, D. 12, L. 7, S. 3, caudal 17. The neural arch 

 ceases on the fifth caudal, beyond which the vertebrse rapidly increase in length to 

 the ninth, after which they again gradually diminish in size. 



