226 MEMOIRS OF THE CARNEGIE MUSEUM 
the Catalogue of Vertebrate Fossils of the Museum as Nos. 307 and 662. More- 
over, a restoration of an entire skeleton has been prepared at the command and 
expense of Mr. Andrew Carnegie, at the suggestion of King Edward VII., of Eng- 
land, and this restoration was set up and installed by the writer in the Gallery of 
Reptiles at the British Museum and formally turned over to the Trustees of that 
institution by Mr. Andrew Carnegie on May 12, 1905. ‘The restoration was made 
in the laboratories of the Carnegie Museum by Mr. Arthur 8. Coggeshall, the efficient 
Chief Preparator in the laboratory, guided and directed in his work ly, Marr 1B: 
Hatcher until the end of June, 1904, when his illness, succeeded by his lamented 
death, compelled the writer to assume supervision of the task, which had not been 
wholly completed. The more recently acquired material and the careful studies 
necessitated by the work of restoration have thrown new light upon the entire sub- 
ject, and it is the purpose of the writer in the following pages to briefly point out 
the additions to our knowledge of the skeletal structure of the genus Diplodocus 
which have thus been secured. At the time of Mr. Hatcher’s death the entire ver- 
tebral column from the axis to the extremity of the caudal series of vertebree, so far 
as they are in our possession, had been placed in position, the ribs had been attached, 
and the fore and hind limbs erected. The atlas and the skull had not yet been 
restored or placed in position, nor had a disposition been made by Mr. Hatcher of 
the sternal plates, nor of the singular bone provisionally described by him as a 
clavicle.” The last professional interview between the writer and Mr. Hatcher took 
place in the Great Hall of the Exposition Society of Western Pennsylvania, where 
the restored skeleton was being assembled preparatory to shipment to London, and 
the time was spent in discussing with Mr. Hatcher the possible position which might 
be assigned to the so-called “sternal plates” and the supposed “clavicle.” Mr. 
Hatcher confessed himself to be greatly puzzled, and the writer fully shared with 
him in the feeling of uncertainty, which prevailed in his mind, a feeling which has 
not been dissipated, and for excellent reasons, as will be made clear in the follow- 
ing pages. With the exception of the sternal plates and the supposed clavicle, 
there is no longer much doubt in the mind of the writer as to the function and 
relative position of all the bones which have thus far been recovered. The arrange- 
ment of the bones of the fore feet was made by Mr. Hatcher as the result of careful 
study, and the reproduction in the British Museum represents his views. The 
writer is, however, inclined to think that the manus in this reproduction is not rep- 
resented in quite a natural position, and is disposed to the view that the feet should 
hold a position somewhat less digitigrade and more plantigrade than was given to 
them by his late associate. 
? MEMOIRS CARNEGIE MUSEUM, Vol. 1., p. 41, and Vol. IL., p. 74. 
