ORTMANN: THE CRAWFISHES OF THE STATE OF PENNSYLVANIA 5138 
BIBLIOGRAPHY. 
1902. Apps, C. The Physiography of Garrett County. Maryland Geological Sur- 
vey, Garrett County. 
1873. Apport, C. C. Notes on the Habits of Certain Crawfish. American Naturalist, 
VII, p. 80. 
1884. Axgport, C. C. Are the “Chimneys” of Burrowing Crayfish Designed? Ameri- 
can Naturalist, X VIII, p. 1,157. 
1885. Apport, C. C. How the Burrowing Crayfish Works. The Inland Monthly, I, 
p. 31. 
1902. Apams, C. C. The Southern United States as a Center of Geographic Distribu- 
tion of Flora and Fauna. Biol. Bull., III, p. 115. 
1905. Avpams, C. C. The Postglacial Dispersal of the North American Biota. Biol. 
Bull., TX, p. 53. 
1895. ANpDREws, E. A. Conjugation in an American Crayfish. American Naturalist, 
XXIX, p. 867. 
1904. ANpDReEws, E. A. Breeding Habits of Crayfish. American Naturalist, XX XVIII, 
p. 166. 
1859. Bet, H. On the Natural History of the Gulf of St. Lawrence, and the 
Distribution of the Mollusca of Eastern Canada. Canadian 
Naturalist and Geologist, 1V, p. 210. 
1877. Bunpy, W. F. On the Cambari of Northern Indiana. Proce. Acad. Nat. Sciences 
of Philadelphia, p. 171. 
1882. Bunpy, W. F. A List of the Crustacea of Wisconsin, with Notes on Some New or 
Little Known Species. Trans. Wisconsin Academy, V, p. 177. 
1883. Bunpy, W. F. The Crustacean Fauna of Wisconsin, with Descriptions of Little 
Known Species of Cambarus. Geol. Surv. Wise., 1873-79, 
I, p. 402. 
1903. CAMPBELL, M. R. Geographic Development of Northern Pennsylvania and Southern 
New York. Bull. Geol. Soc. Amer., XIV, p. 277. 
1880. CarRuu, J. F. The Geology of the Oil Region. Second Geol. Surv. Pa., 13. 
1904. CopELAND, E. B. The Variation of some California Plants. Botan. Gazette, 
XXXVIII, p. 401. 
1889. Davis, W. M. The Rivers and Valleys of Pennsylvania. National Geogr. Mag., 
I, p. 183. 
1844, Der Kay, J. E. Zoology of New York, Part 6, Crustacea, p. 22. 
1905. De Vrtss, H. Species and Varieties, Their Origin by Mutation. Edited by D. 
T. MacDougal. 
1895. Ener, G. H. T. Die Artbildung und Verwandtschaft bei den Schmetterlingen. 
2, Teil, 
