436 THE WASATCH EPOCH. 



cave. It then rises into its vertical laminar ascending process which bounds 

 the nareal opening, and articulates with the anterior part of the nasal 

 bone. The middle and inferior parts of this lamina have a smaller vertical 

 diameter than the i)art adjacent to the nasal bone. The ma.xillary is a little- 

 concave aljove the middle premolar teeth. Its superopo-sterior angle is 

 above the anterior border of the orbit. The superciliary border of the orbit 

 is thick, and its posterior termination is marked by a very obtuse angle with 

 a roughened surface. The anterior temporal ridge is not produced, but is 

 a .strong roughened angle. It becomes a ridge before joining its fellow, and 

 includes with it a narrow deep groove, which is even continued on the ante- 

 i-ior part of the sagittal crest. Although the brain cavity is small, the walls 

 of the temporal fossaj are gently convex in the squamosal region. The 

 orbital border of the malar bone is acute, while the inferior face is truncate, 

 witii a narrow bevel between it and the external face. 



The alveolar face of the maxillary bone terminates in a iVee point 

 above the processus triangularis of the ^jalatine. The anterior border of 

 the zygomatic fossa falls a little anterior to the posterior edge of the last 

 superior molar. The pterygoid alae are broken away, but their bases are 

 quite narrow, and they extend posteriorly to the line of the anterior border 

 of the glenoid cavity. The basioccipital bone is rather wide, and the part 

 immediately anterior to the foramen magnum is concave in longitudinal 

 section, with a weak median keel. Anterior to this point it is not keeled, 

 and the only interruption to the regularity of the surface is seen in a low 

 angulai' tubercle on each side, at the position of the occipito-sphenoid 

 suture. Basisphenoid jilane. The postglenoid process is quite prominent, 

 and is but little extended transversely. A shallow groove passes round 

 within the internal extremity of its base. The meatus auditorius is wide, 

 and the posttympanic process is a short obtuse knob. The paroccipital pro- 

 cess is short and compressed so as to be tranverse. The space between it 

 and the posttympanic is traversed by a low ridge, which has a nearly ante- 

 roposterior direction. The occipital condyles are excavated on their infero- 

 anterior border, so as to produce a prolongation along the inferior edge of 

 the foninicn iniignum to near the middle line. I'he palatal edgcof tho pos- 

 terior nares is reverted. The lachrymal bone is large, forming the anterior 



