62 



MEMOIRS OF THE CARNEGIE MUSEUM 



Explanation op Plates. 



Plate I. Diagram of quarry C, near Camp Carnegie on Sheep Creek, in Albany County, 



Wyoming. The bones lying within the double full line belong to Diplodocus 

 skeleton No. 84. Those in the upper left-hand corner belong to Dijylodocus 

 skeleton No. 94. Those to the right of skeleton 84 belong chiefly to Bronto- 

 saurus, Morosaurus, and Stegosaurus. The several parts of the various skele- 

 tons are represented in the relative position in which they were found imbedded 

 in the matrix. The dotted line represents the line of outcrop on the hillside of 

 the bone-bearing horizon. The irregular full line shows the limits to which the 

 quarry was worked during the season of 1900, by Mr. Peterson and party. The 

 double full line shows the limits to which the quarry was worked in 1899 by Dr. 

 Wortman and party. The caudal vertebrae of No. 84 began near the line of out- 

 crop, while the last of the cervicals were found near the upper end of the quarry 

 as worked out in 1899. The scale is about 7 feet to the inch. ' 



Plate II. Skull of Diplodocus longus Marsh, after Marsh. 



Fig. 1. Side view of skull in U. S. National Museum. 

 Fig. 2. Front view of same skull. 

 Fig. 3. Top view of same skull. 

 All figures one sixth natural size. 



Plate III. Cervical series of Dip)lodocus carnegii (No. 84), complete except for. atlas. Seen 

 from right side ; one tenth natural size. 



Plate IV. Cervical series of Diplodocus carnegii (No. 84), complete except atlas, from photo- 

 graphs ; one eleventh natural size. Seen from right side. 



Plate V. Cervical series of Dijjlodocus carnegii (No. 84). Anterior view, from photographs. 



About one eleventh natural size. Series complete, except atlas. 



Plate VI. Cervical series of Diptlodocus carnegii (No. 84). Posterior view, from photographs. 

 About one eleventh natural size. Series complete save atlas, which is wanting. 



Plate VII. Ten anterior dorsals of Diplodocus carnegii (No. 84), seen from right side, and 

 posterior view of third dorsal. All figures one tenth natural size, cd, prespinal 

 lamina ; 7i?, horizontal lamina ; azl, prezygapophysial lamina ; oZ, oblique lamina ; 

 dl, diapophysial lamina ; p)zl, postzygapophysial lamina ; t, tubercular facet ; c, 

 capitular facet ; ins, median spine. 



Plate VIII. Ten free dorsals of Diplodocus carnegii (No. 84). From photographs about one 

 twenty-second natural size. Column 1, anterior view ; column 2, posterior view ; 

 column 3, as seen from right side. Vertebrae arranged in serial order from dor- 

 sal 1 to 10 in each column, commencing at the right with No. 1 and ending on 

 the left with 10. 



