ORTMA.NN: THE CRAWFISHES OF THE STATE OF PENNSYLVANIA 



517 



1884. Taer, R. S. 



1842. Thompson, Z. 

 1903. Tight, W. G. 



1886. Underwood, L. M. 



189G. Ward, H. B. 



189G. White, I. C. 



1899. Williamson, E. B. 



1901. Williamson, E. B. 



1900. Williamson, E. B. 

 189(). Willis, B. 



Habits of Burrowing Crayfishes in the United States. Nature, 



XXX, p. 127. 

 Natural History of Vermont, I, p. 170. 

 Drainage Modifications in Soutiieastern Ohio and Adjacent Parts 



of West Virginia and Kentucivy. U. S. Gcol. Sun:, Profcsx. 



Papers XIII. 

 List of the Described Species of Freslnvater Crustacea from 



America Xorth of Me.\ico. Bull. III. Stale Lahoralon/, II, p. .365. 

 A Biological Examination of Lake Miciiigan in the Traverse Bay 



Region. Bull. Mich. Fish. Comm., VI, p. lo. 

 Origin of tiie High Terrace Dejwsits of the Monongahela River. 



Amer. Geolofjist, XVIII, p. 368. 

 Notes on Ohio Astacidfe. Seventh Ann. Rep. Ohio State Acad., 



p. 47. 

 The Crayfish of Allegheny County, Pa. Ann. Cam. Mus., I, p. 8. 

 Crayfishes from Kentucky. Ohio Natural., V, p. 310. 

 Tiie Northern Appalachians. (The Physiograj)liy of the L^nitcd 



States. Nat. Geogr. May., p. 169.) 



