206 TEN years' progress IX VERTEBRATE PALEONTOLOGY 



from the pen of the late Prof. John B. Hatcher, giving a restoration of 

 the entire skeleton of Diplodocus, subsequently supplemented by a paper 

 by the present writer, in which attention was called to certain anatomical 

 details not previously known. 



At this point I desire to call attention to the fact that the remarkable 

 prolongation of the tail of Diplodocus has been by the recent discoveries 

 in Utah conclusively shown to be a feature possessed also by other sauro- 

 pod genera. The Carnegie Museum has recovered almost the entire 

 skeleton of a Brontosaunis {?), exceeding in size the largest specimen 

 obtained by Prof. 0. C. Marsh. In this lately discovered specimen the 

 caudal vertebrae were found in a continuous series, terminating at the 

 distal end in a long series of small vertebra? not more than four inches 

 long and about one-half an inch in diameter. Brontosaurus, as well as 

 Diplodocus, was provided with what has been called the "whip-tail." 

 Another interesting revelation is the fact that the limb bones of the 

 Sauropoda were not solid, as originally maintain,ed by Marsh, but were 

 traversed by a well developed medullary cavity. This fact is beautifully 

 demonstrated in the case of specimens recently obtained from the quarries 

 in Utah. 



That the genera representing the Sauropoda were not all discovered 

 through the indefatigable labors of Marsh and Cope has been shown by 

 the recent explorations to which allusion has been made. One of the 

 most remarkable of the new genera is Brachiosaunis of Piggs, a huge 

 dinosaur in which the fore limb apparently exceeded the hind limb in 

 length. 



Before concluding this necessarily brief reference to the work of Amer- 

 ican students, allusion should be made to the studies of Doctor Lull and 

 Dr. 0. P. Hay, the former of whom has given us a valuable paper on the 

 osteology of Stegosaiwus. 



In Europe there has been more or less activity, and in a review of the 

 work of the last ten years attention should be called to the installation 

 in the British Museum of a somewhat fragmentary specimen of Cetio- 

 saurus leedsi A. S. Woodward, taken from the Oxford clays, which in 

 many important points confirms conclusions reached on this side of the 

 Atlantic as to the structure of the sauropod dinosaurs. Interesting and 

 valuable papers have been published by Baron Nopcsa and others who 

 have investigated Jurassic material. The expedition sent out bv the 

 Royal Museum in Berlin under Doctor Janensch to explore the horizons 

 in German East Africa, which had been discovered by Prof. E. Fraas to 

 contain remains of dinosaurs, has already sent back a large mass of ma- 

 terial, on which, however, no detailed and formal report has as yet been 



