Cope.] Dob [March 16, 1883. 



weak attachment to the sphenoid. The lateral superior articular facets of 

 the exoccipital bone are characteristic of the family, and of the genus 

 Gldlonyx. This skull also shows that the premaxillary bones may be dis- 

 tinct, and that they extend but a short distance on the superior face of the 

 muzzle. 



In this species the interorbital region is wide and concave, and the pa- 

 rietal regions are swollen and convex. The supraorbital border is nearly 

 straight, and has an open notch medially. 



The hyposphen varies in size in different parts of the vertebral column, 

 and is generally very large. The neural spines have bilobate extremities. 



Printed April 17, 1883. 



