1898.] Osboni, Additional Cliaracters of Camarasaurus. 225 



are small and obliquely inclined inwards ; the anterior face of the 

 spine has a prominent rugose crest, similar to the crest upon the 

 posterior face of the spine, but the latter (posterior crest) sinks 

 between two prominent laminae, which extend downward to 

 support the post-zygapophyses, pz. 



Fig. 4. Camarasaiinis. First caudal. A, anterior view. /", posterior view. Am. Mus. 

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



Behind this highly specialized vertebra, three vertebrcC were 

 probably intercalated, only one of which is preserved in our 

 collection, giving us the transition to the vertebra estimated as the 

 5th caudal (Fig. 3). 



This supposed 5th caudal (Figs. 3,5) exhibits a marked reduction 

 of the spine as well as of the transverse lamina ; the posterior 

 surface of this lamina being excavated by two deep depressions. 

 This vertebra was followed probably by two, which are missing, 

 so that the fourth preserved in our collection is estimated as the 

 8th caudal (Fig. 5); in this the transverse lamina is still more 

 reduced, and the lateral pockets upon the posterior face are 

 wanting. Behind this is the supposed 9th caudal, which 



\June, iSgS.A, lo 



