X. A NEW SPECIES OF APATOSAURUS. 

 By W. J. Holland. 



In the Carnegie Quarry, near Jensen, Utah, the Carnegie Museum 

 among other specimens has recovered a remarkably perfect skeleton, 

 which is provisionally referred to the genus Apatosanriis. 



The specimen consists of a series of vertebrae, complete from the 

 atlas to nearly the end of the tail. From the anterior dorsals to the 

 posterior caudal vertebrae the bones were found lying in situ, but 

 slightly dislocated. Possibly eight or ten posterior caudals are 

 missing. The tail is very long and contains at least seventy-three 

 vertebrae, of which sixty-four were recovered. The cervical vertebrae 

 had been separated from the dorsals and shifted, but the entire series 

 was found articulated in regular order. The limb bones were found 

 approximately in place, one of the femora being articulated in the 

 acetabulum. The entire left fore limb was found with the bones 

 articulated. The femur, tibia, and fibula of the right hind limb the 

 left femur and the left hind foot were also found. The foot was 

 articulated. The ribs were approximately in position. The whole 

 specimen has been mounted, save that the skull has not as yet been 

 supplied. A skull, which, judging from its location, belongs to the 

 specimen, was found within eleven feet of the atlas. It does not 

 dififer greatly in form from the skull which belongs to Diplodocus, 

 but is much larger than any skull of the latter genus known to the 

 writer. I have already in a previous article (Annals Carnegie 

 Museum, Vol. IX, p. 273) called attention to the uncertainty which 

 exists as to the skull of A patosaurus, and will not renew the discussion 

 in this paper, believing it more prudent to await the result of excava- 

 tions which are now being carried on, and which promise perhaps to 

 yield positive information as to this matter. Mr. Douglass is at 

 present taking up the remains of another specimen, somewhat smaller 

 than the one which has been mounted in the Carnegie Museum, and 

 which seems to be lying in situ. He has not yet reached the region 

 of the cervicals, but is not without hope that the head of this specimen 

 may be found attached to the vertebrae. It seems prudent therefore 



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