PLATE LXXVII—Continued. 
Genus KENSSEL^EIA, Hall. 
Page 254. 
Renssel^ria Cumberland!^, Hall. 
Fig’S. 23-25. Dorsal, iirofile and ventral vie’ws of one of the original specimens; showing the form and pro 
poi'tions of the shell, the marginal plication of the surface, the deltidial plates and sharply de 
fined cardinal slopes. 
Oriskany sandstone. Cumberland, Mwryland. 
RENSSEL.a5RIA INTERMEDIA, Hall. 
Fig. 26. Dorsal view of the exterior ; showing the form and character of plication. 
Figs. 27, 28. Profile views of different individuals ; showing the convexity of the valves. 
Criskany sandstone. Cumberland, Maryland. 
