RELA TIONS AND HABITS OF M OS AS A URS 5 I 



with the first of the pygal vertebrae, as I have contended, but 

 with the second or third at least, as Dollo believed. There were 

 more than ninety vertebrae in the tail. The skeleton measured 

 more than twenty feet in length as it lay in the chalk, with nearly 

 every bone in its proper position. The entire skeleton has been 

 brought to the laboratory in chalk slabs, and when it is finally 

 prepared will, I believe, add a number of new facts to our already 

 full knowledge of these remarkable animals. 



S. W. WiLLISTON. 



