Fig. 1. Historically significant isolated sauropod elements. (a) The holotype tooth of Cardiodon in labial and distal views, modified from Owen (1875a, plate IX, figs 2 and 3); (b) anterior caudal vertebra of Cetiosaurus brevis in anterior view, part of the holotype, photograph by the author; (c) holotype right humerus of Pelorosaurus in anterior view, modified from Mantell (1850, plate XXI, fig. 1b); and (d) lectotype dorsal vertebra of Ornithopsis (see Blows 1995, p. 188) in anterior view, exposing pneumatic cavities owing to erosion of the anterior articular surface, modified from Owen (1875a, plate IX, fig. 1). The scale bar is 5 cm for (a), 10 cm for (b) and (d), and 30 cm for (c).