DINOCERATA. 567 



superoanterior face concave. The posterior face is narrowed by the inferior 

 crest-hke marginG of the temporal fossse, which extend from the squamosal 

 part of the zygoma and gradually contract, terminating abruptly in a low 

 knob where it joins the transverse crest. The posterior face between the 

 former, is divided into two planes by a low vertical ridge, which terminates 

 some distance below the summit. The transverse crest is continued in a 

 curve forward on each side as the superior margin of the temporal fossa. 

 These are very stout, but are broken off near the position of the horns. 



Measurements of occiput. 



M. 



Elevation from foramen magnum 0. 180 



Width between inferior temporal crests 250 



Width of condyles with foramen 180 



Elevation above internal sinnses at angles 180 



The mastoid tuberosity is short and stout; the mastoid foramen is large 

 and not piercing a crest. The ex-occipital suture is obliterated. The V- 

 shaped crest behind the meatus in Loxolopliodon cornutus is little marked 

 here. The surface of the bone has various muscular impressions. The 

 basi-occipital exhibits a low median crest dividing lateral concavities; trans- 

 verse width at condyles .077 M. The fragments of teeth are too uncharac- 

 teristic for specific description. Numerous cranial fragments accompany 

 the above, but have not yet been properly placed. 



The atlas is broken; its cotyloid cavities are rather shallow, and the 

 diapophyses small. Its anteroposterior diameter below at the middle line, 

 is .070; at base of diapophysis .070. The condyles of the femur present 

 the characters of the group. There is a deep vertical groove on the inner 

 side just above the condyle. The latter approach each other closely on 

 each side of the intercondylar fossa and are flattened on the superior poste- 

 rior margins. Width across extremities M. .150. 



The unciform bone is in form a little less than a quarter of a circle, and 

 the external (anterior) depth is one-half its transverse length. Its superior 

 surface is slightly convex. It displays, as in living proboscidians, four in- 

 ferior facets, thus proving the existence of a fifth toe to the hind foot. The 

 external facet is deeply concave, and contains a pit. It is oblique, and 

 unites with the superior face by an acute angle. The internal inferior 



