492 



SINCLAIR— ENTELODONTS FROM THE 



is their extreme pugnacity. In preparing the skull of Archcso- 

 therium wanlessi, I was surprised to find a large antorbital vacuity 

 on the right side, shaped much like an obliquely inclined figure eight 

 (Fig. 21 ), completely perforating the surface of the lachrymal and 

 adjacent anterior tongue of the frontal. A slight indentation occurs 

 also on the frontal above the orbit, and on the opposite side of the 

 skull are two shallow depressions toward the upper edge of the 

 lachrymal, one on the maxillo-lachrymal suture and the other farther 

 back (Figs. 5, 6). All of these seem to be correctly interpretable 

 as battle scars and to indicate that this individual was gripped in 

 front of the eyes by the powerful jaws of an opponent. 



^•2 



^riTN 



Fig. 22. Archaotheriutn scotti sp. nov. Holotype, No. 10885. Left jugal 

 process showing injury to anterior margin, one half the natural size. 



In the specimen of Arcliccotheriuin scotti, Princeton Geological 

 Museum 10885, ^'^ot only is there a fractured rib which never healed, 

 leaving a large callus on each of the broken ends, with an irregular 

 suture separating them, but the left cheek flange has had the front 

 margin bitten ofif (Fig. 22), showing clearly by the scalloped outline 

 where the canines and adjacent incisors penetrated (compare with 

 Fig. i). 



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