MEMOLRS 
OF THE 
CARNEGIE MUSEUM. 
WADIES IOC. NO. 6. 
THE OSTEOLOGY OF DIPLODOCUS MARSH. 
Wirth SprEecIAL REFERENCE TO THE RESTORATION OF THE SKELETON OF DrpLopocus 
CARNEGIE] HatcHER, PRESENTED BY Mr. ANDREW CARNEGIE TO THE 
British Musrum, May 12, 1905. 
By W. J. Hortanp, LL.D. 
In the first volume of the Memoirs of the Carnegie Museum, the late Mr. J. B. 
Hatcher gave an extended account of the Osteology of Diplodocus, based upon two 
specimens contained in the paleontological collections of the Carnegie Museum, num- 
bered respectively 84 and 94 (Carnegie Museum Catalogue of Vertebrate Fossils), sup- 
plemented in part by information derived from the original descriptions of the late 
Professor O. C. Marsh, and the description of the pelvis and portions of the caudal 
vertebree published by Professor Henry Fairfield Osborn in the Memoirs of the 
American Museum of Natural History, Vol. I., Part V. In the second volume of 
the Memoirs of the Carnegie Museum Mr. Hatcher published a brief paper, which 
he entitled ‘Additional Remarks on Diplodocus.”' Since the publication of the 
foregoing papers the Carnegie Museum has secured a large quantity of additional 
material, consisting of two more or less imperfect skeletons, which are designated in 
' MEMOIRS CARNEGIE MusEvuM, Vol. II., p. 72. 
Nore. — The writer desires to express his sincere thanks to Professor Henry Fairfield Osborn and Dr. W. D. 
Matthew of the American Museum of Natural History, to Dr. Theodore Gill, Dr. George P. Merrill, Mr. C. W. Gil- 
more, and Mr. J. W. Gidley of the United States National Museum, and to Dr. Smith Woodward, Dr. C. W. Andrews, 
and Dr. G. A. Boulenger of the British Museum, for valuable suggestions and for allowing him to study the material 
contained in the great collections under their charge. 
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