442 THE WASATCH EPOCH. 



below the iuferior extremity of the hiterral convohition. Section of the 



meduUa oblono-ata a transverse oval; its inferior face, and that of the 



jjons varolii smooth. A deep fossa just anterior to the bases of the optic 



nerves. 



Measurements of brain. 



M, 



Longth from vermis to olfactory lobes inclvisive 070 



Length of olfactory lobes from above 015 



Length of hemisi)liero from above ." 030 



Length of cerebellum from above 0"24 



Depth of olfactory lobe 010 



Depth of hemisphere 023 



Depth of cerebelhuu and medulla -• -OiC 



Depth of medulla at vermis 015 



Width of olfactory lobes at middle 030 



Width of hemispheres in front 024 



Width of hemispheres behind 0-14 



Width of cerebellum •- 036 



Width of medulla at vermis 020 



The cervical vertebrce ai-e considerably smaller than the dorsals. They 

 are not elongate nor yet shortened, but have much the proportions of those 

 of the Tapirus terrcstris, excepting the axis, which is relatively longer and 

 naiTOwer. The expanse of the atlas is less, owing to the shortness of the 

 diapophyses, and it is also smaller relatively to the other cervicals. The 

 fore edge of the diapophysis is regularly convex, and extends inwards an- 

 teriorly, having only a notch between it and the body. The neural arch 

 is rather wide anteroposteriorly, and has an acute edge posteriorly. The 

 arterial groove, parallel to the edge of the condylar cotylus, is well marked. 

 The axial facets are rather wide, and are well separated from each other 

 below. The neurapophyses of the axis are rather narrow fore and aft, so 

 that the anterior part of the neural arch is without support, and projects as 

 a trihedral wedge to above the base of the odontoid process. The bridge 

 inclosing the vertebrarterial canal is also short, and the paradiapophysis 

 sends a short narrow process backwards. The atlantal facets are some- 

 what convex, and are directed upwards and backwards, and have a mod- 

 erately flared posterior edge. The inferior edge at its inner extremit}' is 

 swollen into a transverse tuberosity which does not extend to the middle 

 line. The latter has a low obtuse keel anteriorly, which rises posteriorly 

 to a triangular flat hypapophysial tuberosity, with a roughened surface. 

 The posterior articular face is oblique and quite concave. The postzyga- 

 pophyses are well developed, although rather small. Their articular sur- 



