EUTRACHYTHERUS 77 



have been unusually broad and flat. The maxilla extends 

 up to the nasals, and bounds the lower border of the orbit, 

 and projects backward in a heavy overhanging zygomatic 

 process. The lachrymal bone is large externally, with a 

 large but low lachrymal tubercle just below which is 

 found the lachrymal duct, opening just in front of the 

 margin of the orbit. The frontals are short and wide, 

 extending outward over the orbit in a strong postorbital 

 process which bounds half of the rear of the orbit. The 

 parietals, meeting medianly, rise in a strong sagittal crest. 

 Unfortunately the back part of the cranium is lacking. 



Fig. 46. E. spegazzinianus 1/2 natural size. 



From another specimen, which contained the brain cast, 

 it is clear that the bulla was much inflated and hollow, and 

 that there was an inflation in the upper part of the squa- 

 mosum, as in Prosotherium, etc. 



One specimen with the facial portion badly weathered, 

 but retaining enough to identify the species as E. spegaz- 

 zinianus, preserved the brain case, so that it could be 

 prepared out. 



The most striking feature of this brain is its relatively 

 large size, E. spegazzinianus being an animal about the 

 size of a sheep, and the brain is as large as that of the 

 sheep, which is in strong contrast to what would be ex- 

 pected of an Oligocene form. Compared with the herbiv- 



