PLATE II. 



COMPARATIVE VIEWS OF CRESTS. 



(.See p. 19.) 



Plate prepared under the direction of Lull. 



Fig. 1. Type of Monodonius crassus Cope. No. 3998, American Museum of Natural History. 



Fig. 2. Type of Centrosaurus apertus Lambe. No. 971, Canadian Geological Survey. After Lambe. 



Fig. 3. Type of Triceratops flabellatus Marsh. No. 1821, Yale Museum. After Marsh. 



Fig. 4. Type of Tiiceratops serratus Marsh. No. 1823, Yale Museum. After Marsh. 



Fig. 5. Type of Diceratops hatcheti Lull. No. 2412, U. S. National Museum. 



Fig. 6. Type of Ceratops (Monodonius) belli Lambe. No. 491, Canadian Geological Survey. After Lambe. 



Fig. 7. Type of Torosaurus gladivs Marsh. No. 1831, Yale Museum. 



ep, epoccipitals. sq, squamosal. 



pa, parietal. S qf, squamosal fenestra. 



paf, parietal fontanelle. sqs, squamosal suture. 



pff, postfrontal fontanelle. 



All one-sixteenth natural size. 



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