Goodnight, C. J. 1940. The BranchiobdeUidae of North American Crayfishes. 

 Univ. of Ilhnois Press. Urhana, 111. 



Hyman, L. H. 1931. North American Triclad Turbellaria. Trans. Amer. 

 Micros. Soc, Vol 50. 



Hyman, L. H. 1937. North American Triclad Turbellaria. Trans. Amer. 

 Micros. Soc, Vol. 56. Pp. 298 and 457. 



Hyman, L. H. 1943. The Endemic and Exotic Land Planarians in the United 

 States. Amer. Mus. Novitates, No. 1241. New York. 



Meyer, M. C. 1940. A Revision of the Leeches (Piscicolidae) Living on 

 Fresh-water Fishes of North America. Trans. Amer. Micros. Soc, Vol. 

 59. Pp. 354-377. 



Miller, J. 1929. Leeches of Ohio. Ohio State Univ. Franz; T. Stone Lab. 

 2. Columbus. 



Miller, J. 1937. A Study of the Leeches of Michigan. Ohio Jour. Sci., Vol. 



37, Page 85. 



Moore, J. P. 1905. Hirudinea and Oligochaeta collected in the Great Lakes 

 Region. Bull. U. S. Bureau of Fisheries, Vol. 25. 



Moore, J. P. 1918. The Leeches. Chap. 20 in Ward and Whipple's "Fresh- 

 water Biology". John Wiley & Sons. New York. 



Nachtrieb, Hemingway and Moore. 1912. Report on the Leeches of Min- 

 nesota. Geol. and Nat. Hist. Surv. of Minn., TjdoI. Series No. 5. 



Olson, H. W. 1928. Earthworms of Ohio. Ohio. Biol. Surv., Bull. 17 (Vol. 

 4, No. 2) 



Olson, H. W. 1940. Earthworms of New York State. Amer. Mus. Novitates, 

 No. 1090. 



Smith, F. 1917. North American Earthworms of the Family Lumbricidae. 

 Proc U. S. Nat. Mus., Vol. 52; Pg. 157-182. 



Smith. F. 1918. Aquatic Earthworms and Other Bristle-bearing Worms. 

 Chap. 19 in Ward and Whipple's 'Tresh- water Biology". John Wiley 

 6? Sons. New York. 



Stephenson, J. 1930. The Oligochaeta. Oxford. 



Stringer, C. E. 1918. The Free-living Flatworms. Chap. 12 in Ward and 

 Whipple's "Fresh-water Biology". John Wiley 5? Sons. New York. 



Verrill, A. E. 1874. Synopsis of the North American Fresh- water Leeches. 

 Report U. S. Comm. Fish., Vol. 2; Pg. 666-689 . 



Walton, L. B. 1906. Naididae of Cedar Point, Ohio. Amer. Nat., VoT. 

 40; Pg. 683-706. 



Woodworth, W. McM. 1897. Contributions to the Morphology of the 

 Turbellaria. Bull. Mus. Comp. Zool. Harvard, Vol. 31. 



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