64 



end in sharp points which project downwards and forwards; 

 this portion of the bones is shorter, sharper, and projects 

 more decidedly downwards than in Dinoccras. Above and 

 sHghtly behind the sockets of the cranium, the nasals and 

 maxillaries give rise to the median pair of osseous projec- 

 tions. These are very large, subtrihedral at the base, and 

 project upwards, outwards, and strongly forwards. They 

 differ from the corresponding processes in Dinoccras, in their 

 forward projection, in being longer and more everted, and in 

 their approach to each other at the base. They taper quite 

 regularly from base to tip, but do not come to a point ; a 

 section here would be subcircular. They are not so long 

 and are not knobbed at the ends as in LoxolopJiodon. Their 

 inner curve is convex, the outer concave ; converging below 

 at an angle of 90°, they are united by a strong ridge, which 

 is raised decidedly above the surface of the nasals. At their 

 posterior insertion they touch the frontals, lachrymals, and 

 malars. It is probable that the nasals send up processes on 

 the internal and posterior side of these median projections ; 

 the sutures between these and the maxillary portions are 

 marked by slight ridges. 



Frontals. In our specimen it is very difficult to determine 

 the exact relations of these bones. The nasals narrow at 

 their posterior end, and articulate with the frontals by a 

 V shaped suture which thus encloses them on each side. It 

 is probable that the frontals run to some point between the 

 posterior or parietal projections. If we have discovered the 

 suture, they overlap the parietals, sending up V-shaped 

 processes, which join the sides of the posterior cranial pro- 

 jections, and form a deep concavity with them. They con- 

 stitute a large part of the interior wall of the orbit, but have 

 no post-orbital processes ; the superciliary ridge is very 

 strong, and gradually rises into a large rounded crest, which 

 joins the posterior projection. The frontal eminences are 

 large, and situated immediately over the lachrymals. The 

 upper surface of the frontals is marked b}- two high ridges, 

 which probably represent the divided parts of the sagittal 

 crest ; they rise from the anterior margin of the bones, and 

 are strongest above the frontal eminences. They converge, 

 and then diverging, together forming an X-like curve (with- 



