PLATE II . 



COMPARATIVE VIEWS OF CRESTS. 



(See p. 19.) 



Plate prepared under the direction of Lull. 



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



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



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



Fig. 4. Type of Triceraiops serraius Marsh. No. 1823, Yale Museum. After Marsh. 



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



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



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



cp, epoccipitals. sq, squamosal. 



pa, parietal. sqf, squamosal fenestra. 



paf, parietal fontanelle. sqs, squamosal suture. 



pff, postfrontal fontanelle. 



All one-sixteenth natural size. 



202 



