English: Tibia of RBCM P900, holotype of Ferrisaurus sustutensis, compared to other Laramidian leptoceratopsids. RBCM P900, Ferrisaurus left tibia in (A) medial, (B) and (C) posterior, (D) anterior, and (E) lateral views, and (F) and (G) block removed from anterior face of tibia containing four partial metatarsals. The dashed line in (C) delineates the possible boundary of the astragalus/calcaneum on the tibia, and the dashed lines in (E) indicate the preserved metatarsals in cross-section. CMN 8889, Leptoceratops gracilis left tibia in (H) posterior and (I) anterior view. MOR 300, Cerasinops hodgskissi right tibia in (J) anterior and (K) posterior views, and (L) left tibia in posterior view. Abbreviations: as, astraglus; ca, calcaneum; fib, fibula; ma, matrix; mt, metatarsal.