ART. 18 OX A NEW SKELETON OF DIPLODOCUS GILMORE 15 



Table 2. — Comparative measurements of caudal vertebrae of Diplodocus 



Chevrons. — The total number of chevron bones in Diplodocus is 

 unknown at this time. In the specimen described by Osborn ^^ 

 there were 26, and this number has been followed in later restorations 

 of the tail. I am inclined to the opinion that a still greater number 

 will eventually be found. In the present specimen 18 chevron 

 bones are represented wholly or in part. Six of these were found 

 articulated, one between caudals 4 and 5, and the remaining 5 

 from near the middle of the tail were coossified with their respective 

 vertebrae. 



For the sake of clearness the chevrons are enumerated with the 

 vertebrae; that is, the first chevron which occurs between the 



"Mem. Amer. Mus. Nat. Hist., vol. 1, pt. 5, p. 200, 1899. 



