Preface; Contributors and Reviewers Part I. Overview 1. Forty Years of Ceratophilia / Peter Dodson Part II. Systematics and New Ceratopsians 2. Taxonomy, Cranial Morphology, and Relationships of Parrot-Beaked Dinosaurs (Ceratopsia: Psittacosaurus) / Paul Sereno; 3. A New Species of Archaeoceratops (Dinosauria: Neoceratopsia) from the Early Cretaceous of the Mazongshan area, Northwestern China / Hai-Lu You, Kyo Tanoue and Peter Dodson; 4. A Redescription of the Montanoceratops cerorhynchus Holotype with a Review of Referred Material / Peter Makovicky; 5. First Basal Neoceratopsian from the Oldman Formation (Belly River Group), Southern Alberta / Tetsuto Miyashita, P.J. Currie, and B. Chinnery-Allgeier; 6. Zuniceratops christopheri: The North American Ceratopsid Sister Taxon Reconstructed on the Basis of New Data / Douglas G. Wolfe, James I. Kirkland, David Smith, Karen Poole, Brenda Chinnery-Allgeier, and Andrew McDonald; 7. Horned Dinosaurs (Ornithischia: Ceratopsidae) from the Upper Cretaceous (Campanian) Cerro del Pueblo Formation, Coahuila, Mexico / Mark A. Loewen, Scott D. Sampson, Eric K. Lund, Andrew A. Farke Martha C. Aguillon- Martinez, Claudio A. de Leon, Ruben A. Rodriguez-de la Rosa, Michael A. Getty, and David A. Eberth; 8. New Basal Centrosaurine Ceratopsian Skulls from the Wahweap Formation (Middle Campanian), Grand Staircase - Escalante National Monument, Southern Utah / James I. Kirkland and Donald D. DeBlieux; 9. A New Pachyrhinosaurus-like Ceratopsid from the Upper Dinosaur Park Formation (Late Campanian) of Southern Alberta, Canada / Michael J. Ryan, David A. Eberth, Donald B. Brinkman, Philip J. Currie, and Darren H. Tanke; 10. New Material of "Styracosaurus" ovatus from the Two Medicine Formation of Montana / Andrew T. McDonald and John R. Horner; 11. A New Chasmosaurine (Ceratopsidae, Dinosauria) from the Upper Cretaceous Ojo Alamo Formation (Naashoibito Member), San Juan Basin, New Mexico / Robert M. Sullivan and Spencer G. Lucas; 12. A New Chasmosaurine Ceratopsid from the Judith River Formation, Montana / Michael J. Ryan, Anthony P. Russell, and Scott Hartman; 13. Description of a Complete and Fully Articulated Chasmosaurine Postcranium Previously Assigned to Anchiceratops (Dinosauria: Ceratopsia) / Jordan C. Mallon and Robert Holmes; 14. A New, Small Ceratopsian Dinosaur from the Latest Cretaceous Hell Creek Formation, Northwest South Dakota, USA: A Preliminary Description / Christopher J. Ott and Peter L. Larson Part III. Anatomy, Functional Biology, and Behavior 15. Comments on the Basicranium and Palate of Basal Ceratopsians / Peter Dodson, Hai-Lu You, and Kyo Tanoue; 16. Mandibular Anatomy in Basal Ceratopsia / Kyo Tanoue, Hailu You, and Peter Dodson; 17. Histological Evaluation of Ontogenetic Bone Surface Texture Changes in the Frill of Centrosaurus apertus / Allison R. Tumarkin-Deratzian; 18. Modeling Structural Properties of the Frill of Triceratops / Andrew A. Farke, Ralph E. Chapman, and Art Andersen; 19. New Evidence Regarding the Structure and Function of the Horns in Triceratops (Dinosauria: Ceratopsidae) / John W. Happ; 20. Evolutionary Interactions between Horn and Frill Morphology in Chasmosaurine Ceratopsians / David A. Krauss, Antoine Pezon, Peter Nguyen, Issa Salame, and Shanti B. Rywkin; 21. Skull Shapes as Indicators of Niche Partitioning by Sympatric Chasmosaurine and Centrosaurine Dinosaurs / Donald M. Henderson; 22. The Function of Large Eyes in Protoceratops: A Nocturnal Ceratopsian? / Nick Longrich; 23. A Semi-Aquatic Life Habit for Psittacosaurus / Tracy L. Ford and Larry M. Martin; 24. Habitual Locomotor Behavior Inferred from Manual Pathology in Two Late Cretaceous Chasmosaurine Ceratopsid Dinosaurs, Chasmosaurus irvinensis (CMN 41357) and Chasmosaurus belli (ROM 843) / Elizabeth Rega, Rob Holmes and Alex Tirabasso; 25. Paleopathologies in Albertan Ceratopsids and Their Behavioral Significance / Darren H. Tanke and Bruce M. Rothschild Part IV. Horned Dinosaurs in Time and Space: Paleobiology, Taphonomy, and Paleoecology 26. An Update on the Biogeography of Ceratopsian Dinosaurs / Brenda J. Chinnery-Allgeier and James T. Kirkland; 27. Unraveling a Radiation: A Review of the Diversity, Stratigraphic Distribution, Biogeography, and Evolution of Horned Dinosaurs (Ornithischia: Ceratopsidae) / Scott D. Sampson and Mark A. Loewen; 28. A Review of Ceratopsian Paleoenvironmental Associations and Taphonomy / David A. Eberth; 29. Behavioral Interpretations from Ceratopsid Bonebeds / ReBecca K. Hunt and Andrew A. Farke; 30. Paleontology and Paleoenvironmental Interpretation of the Kikak-Tegoseak Quarry (Prince Creek Formation: Late Cretaceous), Northern Alaska: A Multi-Disciplinary Study of a High-Latitude Ceratopsian Dinosaur Bonebed / Anthony R. Fiorillo, Paul J. McCarthy, Peter P. Flaig, Erik Brandlen, David W. Norton, Pierre Zippi, Louis Jacobs, and Roland A. Gangloff; 31. Taphonomy of Horned Dinosaurs (Ornithischia: Ceratopsidae) from the Late Campanian Kaiparowits Formation, Grand Staircase-Escalante National Monument, Utah / Mike A. Getty, Mark A. Loewen, Eric Roberts, Alan L. Titus, and Scott D. Sampson; 32. A Centrosaurine Mega-Bonebed from the Upper Cretaceous of Southern Alberta: Implications for Behavior and Death Events / David A. Eberth, Donald B. Brinkman, and Vaia Barkas; 33. Insect Trace Fossils Associated with Protoceratops Carcasses in the Djadokhta Formation (Upper Cretaceous), Mongolia / James I. Kirkland and Kenneth Bader; 34. Faunal Composition and Significance of High Diversity, Mixed Bonebeds Containing Agujaceratops mariscalensis and Other Dinosaurs, Aguja Formation (Upper Cretaceous), Big Bend, Texas / Julia Sankey Part V. History of Horned Dinosaur Collection 35. Lost in Plain Sight: Rediscovery of William E. Cutler's Missing Eoceratops / Darren H. Tanke; 36. Historical Collecting Bias and the Fossil Record of Triceratops in Montana / Mark B. Goodwin and John R. Horner Afterword / Philip J. Currie Index; Supplemental CD-ROM: 1. A Ceratopsian Compendium / Tracy L. Ford; 2. Ceratopsian Discoveries and Work in Alberta, Canada: History and Census / Darren H. Tanke