19*3.] ORTMANN— THE ALLEGHENIAN DIVIDE. 385 



Davis, W. M. 



1907. The United States of America. Regional Geography. In : Chapter 

 39 of : Mill, H. R. The International Geography, 1907, pp. 715-735. 

 Dewey, C. 



1856. List of Najades found in Western New York. 9th Ann. Rep. Reg. 

 Univ. N. Y., 1856, pp. 32-38. 

 Fontaine, see : Maury and Fontaine. 

 Foshay, P. M. 



1890. Preglacial Drainage and Recent Geological History of Western 

 Pennsylvania. Amer. Journ. Sei. (3), 40, 1890, pp. 397-403. 



Gabb, A. F. 



1861. List of Mollusks Inhabiting the Neighborhood of Philadelphia. Pr. 

 Acad. Philad., 1861, pp. 306-310. 

 Hartman, W. D., and Michener, E. 



1874. Conchologia Cestrica. 1874. 

 Hayes, C. W. 



1896. The Southern Appalachians. The Physiography of the United 

 States. Nat. Geogr. Soc, 1896, pp. 305-336. 

 Hayes, C. W. 



1899. Physiography of the Chattanooga District in Tennessee, Georgia, 

 and Alabama. 19th Ann. Rep. U. S. Geol. Surv. (1897-98), part 2, 

 1899, pp. 1-58. 

 Hayes, C. W., and Campbell, M. R. 



1894. Geomorphology of the Southern Appalachians. Nation. Geogr. 

 Magaz., 6, 1894, pp. 63-126. 



Hoyt, J. C, and Anderson, R. H. 



1905. Hydrography of the Susquehanna River Drainage System. U. S. 

 Geol. Surv. — Wat. Suppl. & Irrig. Paper no. 109, 1905. 

 Johnson, D. W. 



1905. The Distribution of Freshwater Faunas as an Evidence of Drainage 

 Modifications. Science, 21, April 14, 1905, pp. 588-592. 

 Le Conte, J. 



1891. Tertiary and Post-Tertiary Changes of the Atlantic and Pacific 

 Coasts. Bull. Geol. Soc. Amer., 2, 1891, pp. 223-328. 



Lesley, J. 



1865. Coal Formation of Southern Virginia. Pr. Amer. Philos. Soc, 9, 

 1865, pp. 30-38- 

 Leverett, F. 



1902. Glacial Formations and Drainage Features of the Erie and Ohio 

 Basins. Monogr. U. S. Geol. Surv., 41, 1902, pp. 1-781. 

 Lewis, J. 



1871. On the Shells of the Holston River. Amer. Journ. Conchol., 6, 1871, 

 pp. 216-219. 

 Marshall, W. B. 



1895. Geographical Distribution of the New York Unionidae. 48th Rep. 

 N. Y. State Mus., 1895, pp. 47-99- 



