Figure 3. Comparative ilia. A in On the history, osteology, and systematic position of the Wealden (Hastings group) dinosaur Hypselospinus fittoni (Iguanodontia: Styracosterna)

Figure 3. Comparative ilia. A, Iguanodon (= Hypselospinus) fittoni NHMUK R1635, holotype in lateral view; B, NHMUK R1635 in medial view; C, Iguanodon (= Barilium) dawsoni NHMUK R802, holotype in lateral view; D, NHMUK R802, holotype in medial view. Abbreviations:?brf, brevis fossa non-existent (the area forming a smoothly curved overhang); brf, brevis fossa; lr, lateral ridge that demarcates the brevis fossa;?mr, medial ridge (much reduced); mr, medial ridge very prominent and forming an overhanging ledge; prp, preacetabular process; srf, sacral rib facet (prominent medially and clearly visible laterally). Scale bars = 10 cm.