hatcher: diplodocits (marsh) 57 



In view of the above-noted differences between D. longus as described by Marsh 

 and Osborn, I consider our skeletons (Nos. 84 and 94) as belonging to a distinct 

 species for which I propose the name of Diplodocus carnegii in honor of Mr. Andrew 

 Carnegie, the founder of this institution, and in recognition of his interest in verte- 

 brate paleontology ; which interest he has abundantly and substantially shown in 

 providing the necessary funds for organizing and maintaining a Section of Verte- 

 brate Paleontology in connection with this Museum. No. 84 may be taken as the 

 type of this new species, while No. 94 should be considered as the cotype. 



The principal characters of D. carnegii have been given in the foregoing pages. 

 From D. longus it is readily distinguishable by the smaller cervical ribs and by the 

 caudal spines which are directed much more strongly backward [than are those in 

 the latter species. 



Restoration of the Skeleton of Diplodocus. 



The present restoration is based upon a careful study of skeletons No. 84 and 94 

 of the Carnegie Museum collections supplemented by the material brought together 

 by the late Professor Marsh and noAv in the U. S. National Museum, and by the ex- 

 cellent material of the American Museum of Natural History in New York. The 

 vertebral column is for the most part taken from No. 84, which is complete from 

 the axis to the twelfth caudal inclusive. The atlas and skull are taken from Marsh's 

 figures, while the posterior caudals are taken for the most part fi-om No. 94 supple- 

 mented by Professor Osborn's figures of the splendid caudal series in the collections 

 of the American Museum. The pelvis, scapula, ribs, coracoids, and femur are from 

 No. 84. The tibia, fibula and pes are from No. 94, which, like the American Mu- 

 seum specimen, represented a somewhat smaller individual than that of No. 84, as 

 will be seen by a comparison of the different measurements. The fore limbs and 

 feet are from a second individual in the collections of the American Museum, for 

 the use of which I am indebted to the kindness of Professor H. F. Osborn, to whom 

 also I wish to make acknowledgment for several valuable suggestions which have 

 been especially helpful in the preparation of the present paper. 



In the present restoration the animal is represented in a quadrupedal position as 

 seen from the right side. The position is one which it is believed the animal must 

 have frequently assumed when feeding upon the soft and succulent plants that grew 

 in abundance along the shores of the shallow waters about and in which these 

 Dinosaurs lived in late Jurassic and early Cretaceous times. The slender skull, pro- 

 vided with but few and rather weak teeth, was supported by a very long and flex- 

 ible neck which permitted of an almost unlimited variety of movements throughout 

 a considerable arc. 



