38 



PALMONTOLOQY OF NEW YORK. 



b. Striatus-type : 



S. striatiformis, Meek, 



S. Griinesi, Hall, 



S. Logani, Hall, 



S. striatus, Martin, 



S. Marcoui, Waagen, 

 1. Texan U8-Iine : 



S. Missouriensis, Swallow, 

 S. tenuimarginatus, Hall, 

 S. Mortonanus, Miller, 

 S. cameratus, Morton, 

 S. Texanus, Meek, 



c. Imbrex- type : 



S. Newberryi, Hall, 



S. centronatus, Winchell, 



S. Marionensis, Shumard, 



S. albapinensis, Hall and Whitfield, 



S. biplicatus. Hall and Whitfield, 



S. imbrex. Hall, 



S. Forbesi, Hall, 



S. incertus. Hall, 



S. tenuicostatus. Hall, 



S. lateralis. Hall, 



S. subsequalis. Hall, 



d. Suborbicularis-type : 



S. subrotundatus. Hall, 

 S. suborbicularis, Hall, 

 S. subcardiiformis, Hall, 



e. Orestes-type : 



S. concinnus, Hall, 



S. Grieri, Hall, 



S. Orestes, Hall and Whitfield, 



S. Williamsi, sp. nov., 



S. Keokuk, Hall, 



S, Littoni, Hall, 



S. bifurcatus. Hall, 



Waverly group. 

 Burlington limestone. 

 Burlington limestone. 

 Coal Measures. 

 Coal Measures. 



Choteau group. 

 Keokuk group. 

 Keokuk group. 

 Coal Measures. 

 Coal Measures. 



Waverly group. 

 Waverly group. 

 Choteau and Waverly groups. 

 Kinderhook group. 

 Kinderhook group. 

 Burlington limestone. 

 Burlington limestone. 

 Burlington limestone. 

 Keokuk group. 

 Warsaw limestone. 

 Warsaw limestone. 



Kinderhook group. 

 Keokuk group. 

 Warsaw limestone. 



Lower Helderberg group. 

 Upper Helderberg group. 

 Upper Devonian. 

 Chemung group. 

 Keokuk group. 

 St. Louis group. 

 St. Louis group. 



