Fig. 2. The plastron, or inferior aspect of the carapace of a fossil Turtle (Chelonia breviceps), from the London Clay of the Isle of Sheppey. a, fragment of the entosternal plate; b, b, hyosternal plates; c, c, hyposternals; d, xiphisternals.[66]
[66] See Parkinson, p. 269.
Fig. 3. The cranium of the same species of Turtle, from the Isle of Sheppey. Equally rich in the remains of Chelonian reptiles, as in those of Fishes, Crustaceans, Serpents, and Mollusks, the little Island at the mouth of the Medway has yielded to the indefatigable researches of Mr. Bowerbank the most extensive series of fossil Turtles hitherto discovered in England. The various genera and species will be figured and described in a work now in progress by Professors Bell and Owen, under the auspices of the Palæontographical Society.
Fig. 4. A Serpula (S. antiquata ?), from the chalk, Sussex.
Fig. 5. A dorsal vertebra of a fossil crocodilian reptile (Steneosaurus), from the Oxford Clay of Honfleur. a, b, costal depressions.
Fig. 6. A dorsal convexo-concave vertebra of a crocodilian or gavial-like reptile (Streptospondylus), from the same locality. This figure shows the remarkable character whence the name of this genus: the convexity of the body of the vertebra (a) being situated anteriorly as in mammalia, the reverse of the position of the bones forming the vertebral column in the existing Crocodilians and Lacertians. b, the posterior concavity; c, a deep depression beneath the neural arch.
Fig. 7. Sketch of the lower jaw of an extinct gavial-like reptile (Steneosaurus): the vertebra, fig. 5, probably belongs to the same species. From Honfleur. This figure, and figs, 5, 6, and 8, are copied from Cuvier, "Annales du Muséum"
Fig. 8. A caudal vertebra of the Fossil Animal of Maestricht (Mosasaurus); a, the chevron bone or inferior spinous process (hœmapophysis), anchylosed to the middle of the body of the vertebra.
Fig. 9. Fossil scale of a ganoid fish (probably Lepidotus), from Kent.
Fig. 10. Fossil tooth of a fish of the Shark family (Notidanus microdon, of Agassiz,) from the chalk of Kent.