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Show 238 DR. A. S. WOODWARD ON THE [Apr. 18, nerve. The twenty-first vertebra of tlie same series (text-fig. 44) is essentially similar, but more elongated, without any trace of the transverse process, and with the laminar neural spine considerably overhanging the centrum behind. Cetiosaurus leedsi.- Middle caudal vertebra; left lateral, (A) anterior, and (B) posterior aspects, az., prezygapophysis; pz., postzygapopbysis; tr., transverse process. About j nat. size. Text-fig. 44. Cetiosaurus leedsi.- Posterior middle caudal vertebra; left lateral, (A) anterior, and (I?) posterior aspects, az., prezygapopliysis ; p z., postzygapopbysis. About I nat. size. The last-described vertebra might well be named a posterior caudal, were it not known from American specimens of Diplodocus that the tail of the Sauropodous Dinosaurs was furnished with a long terminal lash. This slender appendage was certainly present in Cetiosaurus, for Mr. Leeds has discovered in the Oxford Olay a chain of ten small vertebrae precisely similar to the terminal Text-fig. 43. |