20 ANNALS NEW YORK ACADEMY OF SCIENCES 



Dorsals : In the restoration made by Cope the number of dorsals was placed 

 at twenty. Later the series was studied at the American Museum, and a com- 

 posite column was made up by placing together vertebrae showing progressive 

 fore-and-.-ift cluu-ncters. At this time tlio number was estimated to be four- 

 teen, of which thirteen were actually represented, dorsal two being absent. In 

 the fall of 1913, opportunity was given tlie present writer by Profe.ssor Henry 

 Fairfield Osborn to restudy these vertebra' in preparation for his monograph 

 on the Sauropoda. It was tlien found tlint by ■the elimination of duplicate 

 bones tlie number is probably ten. 



EELATIONSIIirS 



The close similarity of ('nniaya><(tnni>^ with Morosaiirus has loner boon 

 considered ground fni- [jUu-ing Iho two genera in the same family. At 

 the present time, it a|)|)ears that this similarity is close enough to force 

 the conclusion that the two animals belong to the same genus. Among the 

 characters common to Camamsauni.'^ and Morosaunis. the following may 

 he mentioned : 



1. Centra of dorsals increasing gradually in opisthocoelianism from the 

 posterior to the anterior region. 



2. Principal lamina> supporting the transverse processes strong, with little 

 development of accessory lainintT". 



3. Spines low and broad, with only one cavity of any imj^ortance on their 

 sides. 



4. Caudals short, with inferior surfaces of centra convex in transverse 

 direction. 



5. Scapulfe short, greatly expanded at both proximal and distal ends. 



6. Humerus short and stout, index of maximum length into minimum cir- 

 cumference about .440. 



7. Ulna slightly twisted at the distal end. 



S. Femur very stout, index about .440. Katio of length of femur to length 

 of humerus about .600. 



9. Metacarpals long and slender. 



10. Sacral spines low and broad. 



11. I.scbiuni slender, tapering dist:illy. 



The only characters in which the iwo foi-ins differ are those which may 

 be taken as individual variations or specific characters, such as size, posi- 

 tion of capitular rib facets on anterior dorsals, presence or absence of a 

 median tubercle between the two spines of the anterior vertebra, or slight 

 differences in the laminar supports of the transverse processes. 



It is concluded, therefore, that Camarasannis and Morosaunis are 

 generically identical, and as Camarasaurus has a priority of about one 

 month, the species now under Morosaurus should be referred to the 

 former genus. 



