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Fig. 80. Atlas, axis, and ribs: A, Trinacromerum (Plesiosauria); B, Platecarpus (Mosasauria); C, Baptanodon (Ichthyosauria), after Gilmore; C', Cymbospondylus (Ichthyosauria), after Merriam; D, Sphenodon (Rhynchocephalia); E. Nyctosaurus (Pterosauria); F, Champsosaurus (Choristodera), after Brown; G, Gavialis (Crocodilia); H, Enaliosuchus (Crocodilia), after Jaekel; I, J, Diplodocus (Dinosauria), after Marsh; K, Camptosaurus (Dinosauria), after Gilmore; L, Iguanodon (Dinosauria), after Dollo; M, Chrysemys (Chelonia); N, Iguana (Lacertilia); O, Trinacromerum (Plesiosauria); P, Apatosaurus (Dinosauria), after Riggs.
