111? THE UNITED STATES. 45 



Far. A. With numerous curved ridges instead of nodes, 

 which meet at an acute angle on the anterior margin. 



From the older cretaceous strata of Greene county, 

 Alabama. Mr. T. A. Conrad. 



2. H. torquaius, (S. G. M.) pi. xv. fig. 4. 



Specific character. Transversely suboval or orbicular, with 

 rather distant, profoundly elevated, acute,* oblique costse, the 

 intervening spaces being regularly concave. 



Diameter half to three-fourths of an inch. 



This fossil much resembles a screw. 



From the older cretaceous deposits of Greene county, 

 Alabama. Mr. T. A. Conrad. 



3. H. trabeatus, (S. G. M.) pi. xv, fig. 3. 



Specific character. Transversely oval, with numerous curved 

 or arched undulations. 



Diameter, half an inch. 



From the older cretaceous strata at Prairie Bluff*, Ala- 

 bama. Mr. T. A. Conrad. 



Nummulites. 



N. Mantelli, (S. G. M.) pi. v, fig. 9. 



Specific character. Discoidal, flattened, thin, tapering from 

 the centre to the margin which is sharp ; on each side a cen- 

 tral, pustuloid elevation. 



Diameter from half an inch to an inch and a half. 



Innumerable in white, loose-grained limestone, near 

 Claiborne, Alabama. (Newer cretaceous stratum.) 



* In the annexed plate this character is not well shown, owing to the specimen 

 having been rubbed on the angles. I have now a perfect individual, from which 

 I describe the species. 



