1898.] Osborn, Additional Characters of Camarasaurus. '^ZZ 



in Brontosaiirus. There were, therefore, in all probability, more 

 dorso-lumbars than 14. Cope has assigned 20 dorso-lumbars to 

 Camarasaurus. 



So far as habit and function are involved, the transition from 

 the lateral spined to the median spined dorsals, as in jDronicEi/s, 

 probably indicates that Camarasaurus had a comparatively free 

 anterior dorsal region, consisting of two or more vertebrre, which 

 bore short ribs and moved in all directions with the neck. 



The differences in proportion, in length of limb and in other 

 parts subject to age, sex and individual variation noted in these 

 different specimens are undoubtedly superseded by genuine spe- 

 cific differences which mark the Camarasaurs of different geo- 

 logical levels, also by generic differences, which, however, are still 

 to be positively determined by more careful and thorough explora- 

 tion, and by comparison of the type specimens. The generic 

 name Camarasaurus is therefore provisionally employed here. 



Note i. — Centra of Caudals. 



There is also great diversity in the caudal centra. 



The first caudal centrum is biconvex. 



The second to the estimated seventeenth caudal centra ure froca-loiis. 



The estimated twentieth caudal centrum and all behind it are a/iip/iiavlous. 



Note 2. — Size Sacrum. 



The four sacrals of Camarasaurus exhibit exactly the same measurement as 

 the four anterior sacrals of Brontosaurus. 



