434 NEW YORK STATE MUSEUM 



Pleurotomaria itylus sp. nov. 



Page 318 



31 An enlargement of the surface 



32 The exterior of the shell 



Chautauqua subprovince Forestville 



Pleurotomaria genundewa sp. nov. 



[See pi. 20] 

 Page 319 



33 Apertural view of a barite replacement. X5 



34 Axial view of the interior. X5 



Naples subprovince Genundewa limestone, Middlesex 



