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Show The existence of clavicles in Dinosauria must therefore still be considered doubtful. In conclusion, I wish to express my thanks to Mr. Boulenger, Dr. Forsyth Major, Mr. Pycraft, and Dr. A. S. Woodward at the British Museum, and to Professor Stewart and Mr. R. H. Burne at the Royal College of Surgeons, for their kind help in studying so intricate a question. Literature. G ad ow & S e l e n k a .-Birds: Bronn's Klassen und Ordnungen d. Thierreiches, vol. vi. part iv. G il b e r .- " Das Os priapi der Saugethiere." Gegenbauer's Morphologisches Jahrbuch, 1891. H a t c h e r . - " Diplodocus carnegii." Memoirs of Carnegie Museum, Pittsburg, vol. i. ------ . " Osteology of Haplocanthosaurus, with Appendix on Diplodocus." Loc. cit. vol. ii. [N opcsa .]-Critical Review of Hatcher's Paper on Haplocanthosaurus. Keilhack's Geologisches Centralblatt, 1904. W e b e r .- Die Saugethiere. Leipzig, 1903. W ie d e r sh e im .-Lehrbuch der vergleichenden Anatomie d. Wirbelthiere. Leipzig, 1902. 294 ox t h e su p p o s e d c l a v i c l e o f d ip l o d o c u s . [June 6, |