236 



nl'ovc llic liase. The aiilciior 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 

 asjiect of I he root presents a cavity of absorption for the successional tooth, 

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

 from fossa, 0".019 ; diameter at fossa, 0'".006. 



From a locality at a short distance from the Phasganodiis ancejys. 



Phasganodus 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. Tlie maxillary has a flattened 

 anterior termination, somewliat as in Stratodus (qjicaUs; the superior face 

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

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

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

 following. The form of the teeth differs much IVoni that soon in tlie species 

 of Empo. They have an oval section at the base, Ijut 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 

 sliglit inward curvature. Tlie apex is sharp. Tiie cementuni of the crown 

 is smooth ; but the surflice 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 tiice behind the tooth expands gradually to its base, which 

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

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

 laries, but is lost. Its basis is tinted, and the surface finely striate. Length of 

 bone, 0".015. This specimen was not found with the preceding. The latter 

 was discovered on a bluff near Fort Wallace. 



The surface of the l)t)ne where preserved is wiliiout special sculpture. 

 'V\h' up[)er margin is grooved lor articulation with a supernumerary maxil- 

 lary. Teeth in y'.Ol, two. 



