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Explanation of Plate VI. 
Figure 1. Skull of CentrQsaurus apettus Larabe; lateral aspect; about one- 
eighteenth natural size. 
Figure 2. Skull of Styrticosaurus albertensis Lambe; lateral aspect; about 
one- twentieth natural size. 
Figure 3. Skull of Brachyceratops montanensis Gilmore; lateral aspect; 
one-seventh natural size. After Gilmore. 
