Skeleton of Pentaceratops fenestratus, lateral view 1 12 41. Skull of Triceratops obtusus, lateral view 126 42. Squamosal of Torosaurus latus, ventral view 131 THE CERATOPSIA University of Kansas for information concerning the Triceratops skull there, and to Mr. E. S. Riggs of the Field Museum of Natural History and Mr. F. W. Kohler of the Carnegie Museum for similar aid, as well as to the Field Museum itself for the privilege of reproducing Charles W. Knight's mural of Protoceratofs, which forms the frontispiece. Mr. J. A. Allan of the University of Alberta has kindly furnished the photograph of Chasmosaurus reproduced in Plate VII B.
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