274 MEMOIRS OF THE CARNEGIE MUSEUM. 
No. 1604. Mr. Peterson was enabled by the help of this material to reconstruct 
the vertebre for the mounted specimen in such a manner that no doubt as to its 
true form exists. In No. 17036 the neural spine, the lateral processes, the prezyga- 
pophyses, postzygapophyses, and the walls of the neural canal are well preserved, 
though the lower portion of the centrum is somewhat damaged. Specimen No. 
1712 more nearly approximates No. 1604 in size than any other specimen, and 
preserves all the articulating surfaces except the posterior articulating surface of 
the centrum, from which the epiphysis has been lost. No. 1718 is in nearly the 
same condition as number 1712. Specimen No. 1719 (see Fig. 44, 1-4) is the best 
Fic. 44. Remnant of first dorsal of M. elatus (No. 1604), <3. 1. first dorsal (No. 1719), anterior view; 
2, do., lateral view; 3, do., inferior view; 4, do., posterior view. +. 
preserved of all the first dorsals, but has, like all others mentioned, lost the posterior 
epiphysis of the centrum. Though lacking this surface, the form of the anterior 
articular surface of the second dorsal, which is well preserved in a number of 
specimens, permits the reconstruction of the missing posterior face of the centrum 
of the first dorsal, 
