NEW PARASITE FROM THE CRAYFISH. 73 



Lateral papillze, transverse and hook- longitudinal and blunt, 



shaped, not hook-shaped. 



Eyes, not persistent, persistent in adult. 



Oesophagus, short, long. 



Excretory long, short, 



bladder, 



Testes, close together in me- wide apart, and oblique. 



dian line, 



Uterus, tubular, saccular. 



Ova, 0.07 mm. long, o. i mm. long, 



Residing, in stomach, in intestine of host. 



BIOLOGICAL LABORATORY, HAMLINE UNIVERSITY, 

 SAINT PAUL, MINN., March 10, 1903. 



LITERATURE CITED. 

 Kellicott, D. S. 



'83 Trematodes of the Crayfish. Proc. Am. Micros. Soc., p. 115. 

 Linton, E. 



'92 Notice of Trematode Parasites in the Crayfish. Am. Nat., XXVI., pp. 

 69-70. 



'98 Notes of Trematode Parasites of Fishes. Proc. U. S. Nat. Mus., XX., pi. 

 xvi., Figs. 1-7. 



Looss, A. 



'94 Die Distomen uns. Fischen u. Frosche. Bibl. Zool. Leukart u. Kuhn, XVI. 



'99 Weitere Beitrag. Kentn. Trematoden Fauna. yEgyptens. Zool. Jahrb. Syst., 

 XII. 



Osborn, H. L. 



'02 Notes on the Trematodes of Lake Chautauqua, N. Y. Science, XV., p. 573. 

 Pratt, H. S. 



'03 Synopsis N. A. Invert. Trematodes. Am. Nat., XXXVI. 



Stiles, C. W., and Hassal, A. 



'98 An Inventory of Fasciolidoe. Arch. Parasitol., I., p. Si. 



Ward, H. B. 



'94 On the Parasites of the Lake Fish. L, On D. opacum. Proc. Am. Micros. 

 Soc., XV., pp. 173-182. 



Wedl, K. 



'58 Anat. Beob. u. Trematoden. Sitz. a. k. Akad. Wien., XXVI., p. 242. 



Wright, R. R. 



'84 Trematode Parasites of the Crayfish. Am. Nat., XVII., pp. 429-430. 



