Animals Before Man 



species in wliicli this hollowing out was car- 

 ried to a great extent. It is not easy to under- 

 stand the structure of these remarkable bones 

 even with the aid of a cut ; they must be seen 

 in order that their size and peculiarities may be 

 properly appreciated. 



The entire skeleton of Diplodocus is a 

 trifle over 60 feet long, and stands 12 feet 

 high just over the hips, where the animal was 

 tallest. We are better acquainted with Diplo- 

 docus than with any of his relatives, because 

 one very nearly complete skeleton of this mon- 

 ster has been found, besides large portions of 

 various others, and concerning him we can speak 

 very positively. The thigh-bone is about 5 feet 

 long, but is more slender than that of other 

 species. Brontosaurus was more massively 

 built and a trifle larger, while Morosaurus was 

 somewhat smaller, though still ponderous. The 

 size of the Camarasaurus, from which came the 

 great thigh-bone just mentioned, can only be 

 estimated ; but while the rule of three is not 

 entirely to be relied on, this animal must have 

 been not far from 80 feet long and 16 feet tall. 



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