Note 616 — Chapter XVI
Reading edition
Oss. Foss. tom. v. p. 143, pl. viii. ix.
[617] Reduced figures of two of these vertebræ are given in Lign. 206, figs. 5 and 7, p. 653.
[618] Brit. Assoc. Rep. 1841, p. 92. The position of the articulating surfaces of the oblique processes (zygapophyses) in more perfect specimens, subsequently discovered in various localities of the Wealden, established the existence not only of a saurian allied to the Streptospondylus, but also of other reptiles whose spinal column was wholly or in part made up of vertebræ which were convex in front and concave behind, as in the cervicals and anterior dorsals of certain mammalia. Some of these fossil vertebræ Dr. Melville has referred, with great probability, to the cervical region of the Iguanodon (see Petrif. p. 259); others cannot at present be satisfactorily assigned to any known genus of reptiles.