scott: toxodonta OF THE SANTA CRUZ beds. 
197 
characteristic feature of this skull is the great vertical height of the cra- 
nium, which finds expression in the shape of the occiput. This surface, 
which in N. imbricatus is low and wide, the transverse much exceeding the 
dorso-ventral diameter, in the present species is relatively high and narrow 
and the two diameters are nearly equal, though the width is slightly greater 
than the height. The sagittal crest, which is much higher than in any 
example of N. imbricatus that I have seen, rises abruptly at the junction 
of the supraciliary ridges and thence pursues a nearly horizontal course to 
Fig. 36. 
Nesodon cornutus, type: Occiput, X b (No. 16,012.) 
the occipital crest, where there is a slight descent. The zygomatic arches 
arise lower down upon the occipital crest than in the preceding species 
and much more of the cranial wall is visible in side-view than in them. 
The mastoid process is broken on both sides, but appears to have 
been somewhat narrower than in N. imbricatus. 
