4 MEMOIRS OF THE CARNEGIE MUSEUM 



The original photographs from Avhich many of the figures have been made are 

 by Mr. A. S. Coggeshall, while the drawings were made by Mr. Rudolph Weber and 

 Mr. W. J. Carpenter. 



The first skeleton (No. 84) has been entirely freed from the matrix and is found 

 to consist of the right femur and pelvis complete except for the left ilium, which is 

 for the most part wanting, right scapula and coracoid, two sternals, eighteen ribs and 

 forty-one vertebrae divided as follows : fourteen cervicals including the axis, eleven 

 dorsals, four sacrals, and twelve caudals. These vertebrae are for the most part 

 fairly complete, though unfortunately the sacrals and anterior cervicals are more or 

 less injured. This series of forty-one vertebrae are believed to pertain to one indi- 

 vidual and to form an unbroken series from the axis to the twelfth caudal, although 

 as was shown in a previous paper,^ there is some evidence that there are perhaps 

 one or more interruptions in the series and that one or more vertebrae are missing. 

 On the other hand, as will appear later, it is not entirely impossible that at least one 

 vertebra of this supposed series pertains to a second individual belonging perhaps to 

 a distinct genus. 



Of the second skeleton (No. 94), which pertained to a somewhat smaller indi- 

 vidual than the first, there is a left femur, right tibia, fibula and foot, a complete 

 pelvis, both scapulae and coracoids, and one sternal. These remains were found as- 

 sociated with a few chevrons, fragments of ribs, forty-seven vertebrae consisting of 

 nine cervicals, eight dorsals, twenty caudals, and eleven other vertebrae which have 

 not as yet been sufficiently freed from the matrix to determine their characters. 

 There w^ere also a second pair of ischia, thus demonstrating the presence of 

 remains of at least two individuals among these bones which were for the most 

 part found scattered over an area about twenty feet square situated a short dis- 

 tance (8-35 ft.) south of the position occupied by the anterior cervicals of the 

 first skeleton. (See Plate I., showing diagram of Quarry D from which the 

 remains were taken.) 



In addition to the material already mentioned reference will be made to other 

 remains in the collection of this museum, consisting for the most part of disassociated 

 bones, but belonging undoubtedly to Diplodociis, while for the sake of completeness 

 in the description of the skull and dentition recourse will be had to the published 

 memoirs of Professor Marsh and free use will be made of the excellent description 

 by Professor Osborn of the splendid series of caudals in the collections of the Amer- 

 ican Museum of Natural History. 



3 See Science, N. S., Vol. XII., pp. 828-830, Nov. 30, 1900. 



