140 Scientific Intelligence. 
s 
tus in part? Leidy), from New J ersey. 5, Disc. planior (Disc. 
vetustus in part, Leidy), from Mississippi. 6. Disc. orientalis 
(Elasm. orientalis Cope), from Jersey. 
3. On Elasmosaurus platyurus Cope; by Prof. E. D. Corr. 
> 
and that it is the same as his previously described genus Discosau- 
n these points I would make the fo owing observation 
saurus. Prof. Leidy does not, however, allude to the principal 
cause of this error, which was the similar reversal of the verte- 
bral column in his descriptions of his genus Cimoliusaurus, first 
published in 1851, and re-published with 2 plates in 1864. Having 
my mind pre-occupied with this determination and not suspecting 
the error, I arranged El, urus in accordance with it. The 
ith Disco- 
saurus, I entirely dissent. Dr. Leidy, having assumed the cervicals 
of Cimoliasaurus to be lumbars, and stating it as “ probable that 
part of the series described as lumbars ge d be regarded as repre- 
e true caudals of the 
the two forms in accordance with the structure of Hlasmosaurus, 
failed to reverse the arrangement adopted by Prof, Leidy. Had I 
* Cretaceous Reptiles, N. America, 29, 
