New York State Museum 



Memoir 9' 



Silica replacements of ventral valves of Leptostrophia mag- 

 n i f i c a Hall from pockets of decomposed Oriskany limestone at 

 Glenerie, N. 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. 



