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Explanation of Plate TX. 
Figure 1. Eoceratops canadensis Lambe; view of the more anterior portion 
of the skull from above to show the relation of the elements 
to each other; one-sixth natural size. 
Figure 2. Centrosaurus apertus Lambe; view of part of the skull from above 
for comparison with figure l ; one-sixth natural size. 
Abbreviations — B, postfrontal fontanelle; C, supra temporal fossa; 
F, frontal; H, supraorbital horn-core; L t lachrymal; N, nasal; 
NH, nasal faprn-core ; P, parietal; PF, prefrontal; PTF, 
postfrontal; 3 , squamosal. 
