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unmistakable fragments of the tooth of an Elephant, appar- 
ently, Hlephas Americanus. Dr. N. remarked that we have 
had conclusive evidence of the commingling in this remark- 
able deposit of the fossils representing different geological 
ages. ‘To account for this, we must. suppose that these 
phosphatic nodules were once deposited in different strata 
and have been since re-arranged and commingled by river 
action or shore waves. 
May 22d, 1871. 
The President in the chair. Twenty persons present. 
The President, Dr. J. S. NEWBERRY, announced the dis- 
covery by Prof. O. C. Marsh, of a species of Pterodactylus, 
which he has named P. Owenzi, in the upper cretaceous for- 
mation of Western Kansas. This fact is of importance, as it 
is the first occurrence of this genus in America. It has a 
stretch of twenty feet from the tip of one wing to the tip of 
the other. He also exhibited a specimen of a substance sup- 
posed to be Asphaltum of a peculiar character, and found in 
Colorado. The most remarkable fact connected with this sub- 
stance, is its partial solubility in water. It also possesses a very 
marked aromatic odor when burned. The specimen was re- 
fered to Dr. Schweitzer for Chemical examination. He also 
exhibited an Arrowhead and Copper axe-head and Fragments of 
so-called Aztec Pottery, from Northern Mexico and beyond the 
Plains. Also specimens from a mound near Chattanooga; 
very similar to those from the far West; also modern 
specimens made by the Moquis, and made some remarks in 
connection therewith. Also specimens of large Fossil Oysters, 
Ostrea disparilis, from Virginia, O. triton, from California, and 
O. Georgiana, from Georgia, and made some remarks on the 
