212 THE JOURNAL OF GEOLOGY. 



— The Grand Gulf Formation of the Gulf States. 4 pp., 111. (213-216). — Am. 

 Jour. Sci., Vol. XXXVIII, Sept., 1889. 



— The Chattahoochee Embayment. 5 pp. (128-132). — Bull. Gaol. Soc. Am., 

 Vol. Ill, 1 89 1. 



— The Nita Crevasse. 5 pp. (120-125). 111. — Bull. Geol. Soc. Am., Vol. II. 

 Hallock, W. 



— Report of Committee on Rate of Increase Downward of Underground Tem- 

 perature. 3 pp., with table. — Brit. Assoc. Ad. Sc, 1892. 

 Kerr, W. C. (and Geo. B. Hanna). 



— Ores of North Carolina. 235 pp. (125-359), 27 pi., geol. map and numerous 

 cuts.— Geol. of North Carolina, Vol. II, Chap. II, 1888. 

 Keyes, Charles R. 



— Lower Carbonic Gasteropoda from Burlington, Iowa. The American Species 

 of Polyphemopsis. Sphaerodoma : A Genus of Fossil Gasteropods. 126 pp. 

 283-309). — Proc. Acad. Nat. Sci. of Philadelphia, Sept. 24, 1889. 



— The Principal Mississippian Section. 18 pp. (283-300), 9 pi., Vol. III. — 

 Bull. Geol. Soc, Am., June, 1892. 



— On the Fauna of the Lower Coal Measures of Central Iowa, and Descriptions 

 of Two New Fossils from the Devonian of Iowa. 27 pp., i pi. — Proc. Acad. Nat. 

 Sci., Philadelphia, July 31, 1888. 



— The Redrock Sandstone of Marion County, Iowa. 4 pp. (273-276), 111. — 

 Am. Jour. Sci., Vol. XLI, April, 1891. 



— Surface Geology of Burlington, Iowa. 6 pp. (1049-1054). — Am. Naturalist, 

 Vol. XXII, Dec, 1888. 



— The Coal Measures of Central Iowa, and Particularly in the Vicinity of Des 

 Moines. 9 pp. (396-404), 111. — Am. Geol., Dec. 1888. 



— Genesis of the Actnocrinidse. 12 pp. (243-254), 3 pi. — Am. Naturalist, 

 March, 1890. 



— The Sedimentary Habits of Platyceras. 4 pp. (269-272). — Am. Jour. Sci., 

 Vol. XXXVI, Oct. 1888. 



— Discovery of Fossils in the Limestones of Frederick County, Maryland. 3 pp., 

 111. — Johns Hopkins University Circulars, No. 83. 



— On Some Fossils from the Lower Coal Measures at Des Moines, Iowa. 6 pp. 

 (23-28).— Am. Geol., July, 1888. 



— On the Attachment of Platyceras to Paljeocrinoids, and its Effects in Modify- 

 ing the Form of the Shell. 13 pp., i pi. — Proc. Amer. Philos. Soc, Vol. XXV, 

 No. 128, Oct. 1888. 



— Synopsis of American Carbonic Calyptrseidas. 32 pp. (150-181), i pi., i 

 table. — Proc. Acad. Nat. Sci., Philadelphia, 1890. 



■ — Review of the Progress of American Invertebrate Palseontology for the year 

 1890. 7 pp. (327-333). — Am. Nat., April, 1891. 



— The Naticoid Genus Strophostylus. 7 pp., i pi. — Am. Nat., Dec. 1890. 



— Review of the Progress of American Invertebrate Palseontology for the year 

 1889. 8 pp. (131-138).— Am. Nat., Feb. 1890. 



— The Petrography and Structure of the Piedmont Plateau in Maryland, by 

 George Huntington Williams, of Johns Hopkins University, with a Supplement 

 on a Geological Section Across the Piedmont Plateau in Maryland. 22 pp. 

 (301-322), I pL, 111.— Bull. Geol. Soc. Am., Vol. II, March, 1891. " 



— Stratigraphy of the Carboniferous in Central Iowa. 16 pp. (277-292), 2 pi. — 

 Bull. Geol. Soc, Am., Vol II, March, 1891. 



— An Annotated Catalogue of the Mollusca of Iowa. 23 pp. — Bull. Essex 

 Inst., Vol. XX, 1889. 



— Fossil Faunas in Central Iowa. 24 pp. (242-265). — Proc. Acad. Nat. Sci., 

 Philadelphia, April 28, 1891. 



— Remarks on the Perisomic Plates of the Cnnoids. 2 pp. 



— Soleniscus : Its Generic Characters and Relations. 5 pp. (420-424), i pi. — 

 Am. Nat., May, 1889. 



— Proposed Economical Geological Survey of Iowa. 6 pp. — Iowa State 

 Register, July 12, 1891. 



