New York State Museum 



Memoir 9 



Silica replacements of ventral valves of Leptostrophia mag- 

 nifica Hall from pockets of decomposed Oriskanv limestone at 

 Glenenc, X. Y. Introduced to show the perfection of preservation. 

 The lower figure shows a circular perforation of the shell near the 

 cephalic center of the brachiopod, probably made by the mollusk 

 Diaphorostoma. 



