360 



Rev. H. N. Hutchinson — Observations on 



pointed out the compressed shape of the hody, like that of a herring, 

 as confirming the evidence of aquatic habits (see Fig. 1). 



Fig. 1. — Eibs of Diplodoctis in position. 

 History of the Skeleton. 



We must now consider the skeleton in detail. In dealing with 

 this skeleton, it must be remembered that we have before us not the 

 actual skeleton, but a reconstruction thereof. Each bone, as we 

 see it, is a cast made from a model, and these models are based on 

 several finds of Diplodocus made at different times by Marsh, Osborn, 

 Holland, and others. 



Materials for the Reconstructed Skeleton. 



Before we proceed to discuss this reconstructed skeleton, it will 

 be convenient to indicate very briefly the nature of the fossilized 

 material on which it is based. Dr. J. B. Hatcher explains in his 

 two valuable papers, (1) Mem. Carnegie Museum, vol. i, p. 4, (2) Mem. 

 Carnegie Museum, vol. ii, p. 58, that his illustration of the skeleton, 

 as far as he knew it then, was based on two skeletons neither of 

 which was complete: (1) that known as No. 84, collected by 

 Dr. J". L. Wortman in the expedition of 1899, and (2) another 

 collected by D. A. Peterson in the expedition of 1900, in the same 

 quarry in Sheep Creek in Albany, County Wyoming. 



From a paper by Dr. W. J. Holland (Mem. Carnegie Museum, 

 vol. ii, p. 225), we learn that since Dr. Hatcher's papers were 

 published two other imperfect skeletons have been found. 

 Apparently the skeleton set up in London may be taken in a general 

 way to correspond with the drawing in Dr. W. J. Holland's memoir 

 already referred to. 



