GUELPH FAUNA IN THE STATE OF NEW YORK 1 45 



FIG. 



6 Lateral view of the two valves in apposition reconstructed 



from the brachial and pedicle valves figured on this plate, 

 showing the long straight cardinal region, the nearly 

 straight profile of the pedicle valve and the more convex 

 contour of the brachial valve 



7 An internal cast of a large pedicle valve, showing the high 



cardinal area, the very deep platform vaults and the charac- 

 teristic markings of the platform, as well as the impressions 

 of the sides of the crescent, and the anterior septum 

 All specimens are drawn natural size, and are from the Lower 

 Shelby bed at Shelby N. Y. Originals in N. Y. State Museum. 



