PLATE I. 



Fig. 1. Suecoccras (?) iiiacqnabile, Miller. Lower end of siphuncle, laterally 

 compressed. From the Orthoccras fosteri layer, at the base of the 

 Clarksville division of the Waynesville bed, in the Stony Hollow, 

 northwest of Clarksville, Ohio. 



Fig. 2. Snecoceras (?) inaequabile, Miller. Lower end of siphuncle. Madi- 

 son, Indiana, from the Waynesville bed. 



Fig. 3. Ortlwccras (Ormoccras?) hitsi. Smooth orthoceracone, with vertical 

 striae due to weathering. Madison, Indiana, from the Hitz layer, 

 at the top of the Saluda bed. 



Fig. 4. Dazvsonoccras hammcUi. Dog Falls, on Saluda creek, southwest of 

 Hanover, Indiana, from the Hitz layer at the top of the Saluda 

 bed. 



Fig. 5. Orthoccras (Loxoccras) fiiillcri. Orthoceracone, with traces of the 

 smooth shell. Two miles south of the Crow distillery, 7 miles 

 south of Frankfort, Kentucky, from the Perryville bed. 



Fig. 6. Spyroceras hiUncatum-frankfortensis. South of Glenn creek, at the 

 Crow distillery, 6 miles south of Frankfort, Kentucky, from the 

 Logana bed. 



Fig. 7. Cyrtoceras hitzi. Convex side of cyrtoceracone. B, the same, en- 

 larged. Madison, Indiana, from the Hitz layer, at the top of the 

 Saluda bed. 



Fig. 8. Clidopliorits. New species, resembling Clidopliorus ncglcctiis in out- 

 line, but with the posterior umbonal ridge less strongly defined, and 

 with the clavicle directed slightly forward from the beak, limiting 

 a shorter anterior muscle scar. B, the same, inverted and enlarged. 

 Clifton, Tennessee, from the Saltillo bed. 



Fig. 9. Opisthoptera concordensis. Left valve, with the outline not preserved 

 and not known. In the creek bed south of the railroad bridge, east 

 of Concord, Kentucky. From the upper part of the Arnheim bed, 

 five and a half feet below the Strophomcna concordensis zone, 

 associated with Streptelasma vagans. 



Fig. 10. Pterinca (Caritodens) demissa, Conrad. Left valve. Clifton, Ten- 

 nessee, from the Arnheim bed. 



Fig. .11. Lahechia (?) corriigata. Dutch creek, northwest of Wilmington, 

 Ohio, from the top of the Whitewater bed. 



