.] Osl?o>ii, Additional Characters of Camarasaurtis. 223 



2. Description of Skeleton. 



The mid-dorsal (Fig. 2) corresponds closely with the supposed 

 ' posterior-dorsal,' described by Marsh as belonging to Brontosaurus 

 excelsus (Fig. 12). With the exception of the anterior portion of 

 the centrum and the extremities of the tubercular processes, this 

 vertebra is in a remarkable state of preservation, the neural spine 



Fig- 2. Camarasaurus. Mid-dorsal. A^ anterior view. P, posterior view. Am. Mus. 

 Coll. R. 222. Approximately j'j natural size. 



being complete upon the anterior face, and lacking only the upper 

 and lateral portions. It displays the characteristic hyposphen, 

 the complex laminated and excavated condition of the spine, and 

 a pair of small cavities ujjon the sides of the centra. 



The true posterior dorsal (Fig. 3) is a superb vertebra, in 

 nearly perfect preservation, lacking only the anterior portion of 

 the tip of the spine, parts of the extremities of the tubercular 

 processes, and the anterior face of the centrum. It corresponds 

 closely with Cope's type of Amphicoelias ait us (Fig. 13) both in 

 form and measurement, and in the lateral cavities of the centra. 



