EXPLANATION OF PLATE XXIV. 
The figure on the left is a view from above of the skull of Diplodocus bearmg Professor 
Marsh’s No. 1922 (U.S. N. M., No. 2673). The photograph shows that the right side of the 
skull has been more exposed-to crushing than the left. 
The figure on the right isa view from above of the skull of Dlplodocus bearing Professor Marsh’s 
No. 1921 (U.S. N. M., No. 2672). Only the right half of the anterior portion of the skull is 
preserved in this specimen. But it shows the posterior parts of the skull in some respects to better 
advantage than they are shown in the skull catalogued by the U. 8. N. M. as No. 2673. 
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