348 Analysis of Ores from North Carolina. 



N. percallosa. Spire convex-depressed ; surface with fine obsolete 

 spiral strife, umbilicus closed by a profound callus. Differs from N. 

 duplicata in having the umbilicus perfectly concealed, and in the de- 

 pressed spire. I think this species occurs recent on the southern coast. 



Infundibulum. 

 Infundihulum centralis. Obtusely ovate, with fine concentric irreg- 

 ular lines ; apex central. 



POLYP ARIA. 



LUNULITES. 



LunuUtes denticulata. Prominently convex ; apex slightly promi- 

 nent ; pores elliptical, arranged in quincunx order, and having slender 

 projecting spines on the inner submargin ; base with ramose minutely 

 granulated lines ; margin denticulated. 



L. depressa. Suboval, convex-depressed ; pores unequal in size and 

 irregular in form ; many of the larger pores filled with a minutely po- 

 rous plate or diaphragm, solid in the centre ; others denticulated on the 

 inner submargin ; base granulated, and with very numerous minute 

 ramose striae, slightly impressed ; margin denticulated. 



Art. IX. — Analysis of various Ores of Lead, Silver, Copper, 

 Zinc, Iron, &^c.,from King^s Mine, Davidson County, North 

 Carolina; by Prof. James C. Booth.* 



The Washington Mining Company of Davidson county, North 

 Carolina, was commenced under the enterprise of Roswell King, 

 Esq. several years since, but in consequence of the monetary 

 difficulties of our country, the progress of the active mining ope- 

 rations was retarded until it received an impulse during the past 

 year, which promises liberally to reward the enterprise of those 

 engaged in it. Having received specimens of the vein only, and 

 none from the adjacent formations, I am unable to give its geolo- 

 gical position. The main body of the working vein appears to 



* To B. SiLtiMAN, Jr. 



Dear Sir — Agreeably to the opinion expressetl to me when you were lately in 

 this city, that the results of the analyses performed in my laboratory on the silver 

 and lead ores from North Carolina, would be interesting to the public, and having 

 obtained permission of the proprietors of the mines to give publicity to the results, 

 1 herewith transmit you an outline of the same. Respectfully yours, 



Philadelphia, June, 1841. J. C. Booth. 



