236 



above the base. The anterior cutting-edge extends to the bottom, while the 

 posterior reaches only half-way down ; there is no barb. The section of the 

 base exhibits an angle in continuation of the latter. The inner face is a little 

 more convex that the outer; its posterior half is rather coarsely striate-keeled. 

 The posterior half of the outer face is finely striate. The inner posterior 

 aspect of the root presents a cavity of absorption for the successional tooth, 

 as in P. anceps. The cutting-edge and tip of apex are glossy black. Length 

 from fossa, 0™.019 ; diameter at fossa, CT.006. 



From a locality at a short distance from the Phasganodus anceps. 



Phassanodus anceps, Cope. 



Established on portions of a right maxillary bone of one individual, and 

 perhaps the premaxillary of a second. The former supports six teeth and 

 four empty alveoli; teeth on the maxillary. The maxillary has a flattened 

 anterior termination, somewhat as in Stratodus apicalis; the superior face 

 being excavated and widened, and gradually descending to meet the inferior. 

 The line of junction, where also the premaxillary commences, is oblique from 

 before inward and backward. The anterior tooth is a little larger than those 

 following. The form of the teeth differs much from that seen in the species 

 of Empo. They have an oval section at the base, but speedily become 

 much compressed in a direction oblique to the long diameter of the bone, 

 and develop cutting-edges opposite to each other, and separating equal faces. 

 The crown is a little more convex on one edge than the other, and has a 

 slight inward curvature. The apex is sharp. The cementum of the crown 

 is smooth ; but the surface of the basal portion below the commencement of 

 the cutting-edges is minutely striate-grooved; some grooves being deeper than 

 others; the surface having a silky luster. 



The inferior face behind the tooth expands gradually to its base, which 

 is marked by the narrow crescentic scar of the older tooth seen in Enchodus 

 pressidens. The crown of the tooth was scarcely as large as that of the maxil- 

 laries, but is lost. It* basis is fluted, and the surfa.ee finely striate. Length of 

 bone, m .015. This specimen was not found with the preceding. The latter 

 was discovered on a bluff near Fort Wallace. 



The surface of the bone where preserved is without special sculpture. 

 The upper margin is grooved for articulation with a supernumerary maxil- 

 lary. Teeth in m .()l, two. 



