FURTHER OBSERVATIONS ON THE POSE OF 

 THE SAUROPODOUS DINOSAURS 



OLIVER P. HAY 

 Washington, D. C. 



Since the publication 1 of my paper on the manner of 

 locomotion of the Sauropoda a number of communica- 

 tions have appeared which treat of the same subject. 

 Two of these I wish especially to notice here, both of 

 w! licit have appeared in the American Naturalist, one 

 of these being written by Dr. W. J. Holland f the other 

 by Dr. W. D. Matthew. 3 A third interesting and instruc- 

 tive paper, from the pen of Dr. 0. Abel, appeared in 

 March, 1910, in the Abhmidhnigen der k. k. zool.-botan. 

 Gesellsch. in Wien, Volume V, Heft 3, pp. 1-60. 



Dr. Holland experiences many difficulties in his at- 

 tempts to articulate the bones of Diplodocus so as to give 



the animal a post 



i like that of the 



crocodile and of the 



lizard. His Fig. < 



), on page 268 of I 



lis communication, is 



intended to illusi 



trate some of hi* 



; perplexities. "Of 





" he savs. -the hind limb of the Diplo- 



docus could have 



been to him in sin 



eh a position I leave 





for yourselves." 



Now, although the 



proximal ends of 





mt all placed as they 



are in the lizard 



or the crocodile, 



nevertheless, taking 



them as Dr. Holla 



nd has placed thei 



n, it is difficult to see 







th the pelvis and the 







r ataxia, it could not 



lift itself out of t 





'or it. Furthermore, 

 tv their knees above 



the level of their 





aras it necessary for 



sauropods to do \ 



this. Dr. Holland 



finds trouble also at 



