NO. 12 CHARLES DOOLITTLE WALCOTT 27 



1891. Discussion of paper by H. R. Geiger and Arthur Keith on the structure 



of the Blue Ridge near Harper's Ferry. Bull. Geo!. Soc. Amer., Vol. 2, 



Feb. II, 1891, pp. 163-164. 

 1891. Discussion of paper by H. M. Ami on the geology of Quebec and envi- 

 rons. Bull. Geol. Soc. Amer., Vol. 2, Apr. 30, pp. 501-502. 

 1891. Discussion of paper by Robert T. Hill on the Comanche series of the 



Texas-Arkansas region. Bull. Geol. Soc. Amer., Vol. 2, May 5, 1891, 



pp. 526-527. 

 1891. Discussion on the geological structure of the Selkirk Range. Bull. Geol. 



Soc. Amer., Vol. 2, Aug. 7, 1891, p. 611. 

 1891. Report of Mr. Charles D. Walcott, in Administrative reports of chiefs 



of divisions, nth Ann. Rep. U. S. Geol. Surv. 1889-1890, Pt. i, 1891, 



pp. 102-106. 

 1891. Correlation papers — Cambrian. Bull. U. S. Geol. Surv., No. 81, 1891, 



pp. 1-447, pis. I-HI. 

 1891. Report of Mr. C. D. Walcott, in Administrative reports of chiefs of 



divisions. I2th Ann. Rep. U. S. Geol. Surv. 1890-1891, Pt. i, 1891, 



pp. 106-111. 

 '1891. The North American Continent during Cambrian time. 12th Ann. Rep. 



U. S. Geo!. Surv. 1890-1891, Pt. i, 1891, pp. 523-568, pis. XUI-XLV. 

 1 891. Auffindung von Fischresten im Untersilur. Neuen Jahrbuch fiir Minera- 



logie, Bd. I, 1891, pp. 284-285. 

 1891. Report on the Department of Paleozoic Fossils in the U. S. National 



Museum, 1889. Ann. Rep. Smithsonian Inst. 1889, Rep. U. S. Nat. 



Mus., 1891, pp. 391-396. 



1891. Report on the Department of Paleozoic Fossils in the U. S. National 



Museum, 1890. Ann. Rep. Smithsonian Inst. 1890, Rep. U. S. Nat. 

 Mus., 1891, pp. 233-234. 



1892. Preliminary notes on the discovery of a vertebrate fauna in Silurian 



(Ordovician) strata. Bull. Geol. Soc. Amer., Vol. 3, March, 1892, 



pp. 153-172, pis. 3-5. 

 1892. Notes on the Cambrian rocks of Virginia and the southern Appalachians. 



Amer. Journ. Sci., 3d Ser., Vol. XLIV, July, 1892, pp. 52-57. 

 1892. Note on Lower Cambrian fossils from Cohassett, Mass. Proc. Biol. 



Soc. Washington, Vol. VII, July, 1892, p. 155. 

 1892. Notes on the Cambrian rocks of Pennsylvania and Maryland, from the 



Susquehanna to the Potomac. Amer. Journ. Sci., 3d Ser., Vol. XLIV, 



Dec, 1892, pp. 469-482. 

 1892. Systematic list of fossils of each geological formation in the Eureka 



District, Nevada. Appendix to Arnold Hague's Geology of the 



Eureka District. Monogr. U. S. Geol. Surv., XX, 1892, pp. 317-333. 

 1892. Report of Mr. C. D. Walcott, in Administrative reports of chiefs of 



divisions. 13th Ann. Rep. U. S. Geol. Surv. 1891-1892, Pt. i, 1892, 



pp. 135-140- 



1892. Report on the Department of Paleozoic Invertebrate Fossils in the U. S. 



National Museum, 1891. Ann. Rep. Smithsonian Inst. 1891, Rep. 

 U. S. Nat. Mus., 1892, pp. 245-248. 



1893. The Natural Bridge of Virginia. Nat. Geogr. Mag., Vol. V, July 10, 



1893, PP- 59-62. 

 1893. The geologist at Blue Mountain, Maryland. Nat. Geogr. Mag., Vol. V, 

 July 10, 1893, pp. 84-88. 



