10 MEMOIRS OF THE CARNEGIE MUSEUM 



their right sides, so that this side is as a rule best preserved. The pelvis and caudal 

 vertebrae were near the surface. The caudals were interrupted at the twelfth, which 

 lay on the line of outcrop of the bone-bearing horizon. The succeeding caudals were 

 missing, having been removed by surface erosion. From the twelfth caudal anteriorly 

 the vertebral column extended into the gently sloping hillside, with, however, some 

 displacements. Unfortunately no diagram of the quarry was made, at the time of 

 exhuming the remains, showing the relative position of each of the several vertebrse 

 and other bones as they lay imbedded in the rock. Early the following spring 

 Mr. W. H. Reed, who assisted in taking up the skeleton, returned to the quarry 

 and made for the writer a diagram showing the location of the various parts of 

 the skeleton as he remembered them. This diagram has been submitted to Dr. 

 Wortman, under whose supervision the skeleton was unearthed, and to Mr. A. S. 

 Coggeshall, who also assisted Dr. Wortman in unearthing the remains. Both these 

 gentlemen agree that it is essentially correct. It is reproduced in PI. I., where it is 

 included in the diagram of the entire quarry as worked out during the season of 

 1900 by Mr. O. A. Peterson* and party. It occupies the central and lower portion 

 of the plate and includes all those bones lying within the space bounded by the 

 double full line and the broken line below, which latter marks the line of outcrop 

 of the bone-bearing horizon in the quarry. 



This diagram shows that while there were some displacements in the vertebras, 

 these were not so great or of such a nature as to preclude the possibility of their 

 representing in so far as they go an uninterrupted series. On the other hand the ' 

 different vertebrae did not lie in such relative positions as to make it certain that 

 none were missing from the series. 



Mr. A. S. Coggeshall, who assisted in unearthing the skeleton, contributes the 

 following statement concerning its disinterment and the relative position of the dif- 

 ferent parts as they lay imbedded in the matrix. He says: "Work was carried on 

 in both directions from the sacrum. Posteriorly the caudals extended in an almost 

 continuous series to the twelfth, where the bone-bearing horizon emerged on the 

 surface of the gently sloping plain. The animal had evidently fallen on his right 

 side, and that being more deeply imbedded, was better preserved than the left. The 

 ilia were in position, coossified with the sacrum, but the left ilium and a considerable 

 portion of the sacral vertebrse were so near the surface as to have become badly dis- 

 integrated and in a hopeless condition. In front of the sacrum, with which the last 

 dorsal was coossified, the last seven dorsals extended in a continuous series, more or 

 less completely interlocked by their zygapophyses. The eighth and ninth presacrals 

 were interlocked, but shifted somewhat from their natural position, and stood on 



