86 ILLINOIS BIOLOGICAL MONOGRAPHS (304 



Stafford, J. 



1900. Some undescribed Trematodes. Zool. Jahrb., Syst., 13:399-414; 1 pi. 

 1902. Cephalogonimtis americanus (new species). Centrlbl. Bakt. Par., Abt. I, Orig., 

 32:719-725; 1 pi. 

 Stiles, C. W. and Hassall, A. 



1894. A preliminary catalogue of the parasites contained in the collections of the 

 United States Bureau of Animal Industry, United States Army Medical Museum, 

 Biological Department of the University of Pennsylvania (Coll. Leidy) and in 

 Coll. Stiles and Coll. Hassall. Vet. Mag., 1:245-253, 331-354. 



1908. Index-Catalogue of Medical and Veterinary Zoology; Subjects Trematoda and 

 Trematode diseases. Hygienic Lab., Bull. 37 :401. 



Stossich, M. 



1902. H Monostomum mutabile Zeder e le sue forme affine. Boll. Soc. adriat. sci. nat. 

 Trieste, 21:1-40; 9 pi. 

 Stxjnkard, H. W, 



1917. Studies on North American Polystomidae, Aspidogastridae, and Paramphistomi- 

 dae. 111. Biol. Monogr., 3-281-394; 11 pi. 



1919. On the specific Identity of Heronimus chelydrae MacCallum and Aorchis exknsus 

 Barker and Parsons. Jour. Par., 6:11-18; 2 pi. 

 Taschenberg, O. 



1879. Didymozoon, eine neue Gattung in Cysten lebender Trematoden. Ztschr. ges. 

 Naturw., 5:605-617. 

 Tyzzer, E. E. 



1918. A monostome of the genus Collyriclum occuring in the European sparrow, with 

 observations on the development of the ovum. Jour. Med. Res., 38:267-292; 

 4 pi. 



Vaillant, L. 



1863. Note sur deux helminthes trematodes observ6s chez la sirfene lacertine. C. r. Soc. 



biol., 4:6-7. 

 1863a. Note sur quelques helminthes de la sirSne lacertine. Ann. sci. nat., Zool., 19: 

 347-350, 1 pi. 

 Ward, H. B. 



1909. The Influence of Hibernation and Migration on Animal Parasites. Proc. 7. 

 Internat. Zool. Cong., 12 pp. 



1917. On the Structure and Classification of North American parasitic Worms. Jour. 

 Par., 4:1-12; 1 pi. 



1918. Parasitic Flatworms. In Ward and Whipple, Fresh Water Biology. Pp. 365- 

 453; 114 fig. 



1921. A New Blood Fluke from Turtles. Jour. Par., 7:114-129; 1 pi. 

 Ward, H. B. and Hirsh, E. F. 



1915. The species of Paragonimus and their diflferentiation. Ann. Trop. Med. Par., 

 9:109-162; 5 pi. 

 Wedl, C. 



1857. Anatomische Beobachtungen Uber Trematoden. Sitz. Akad. wiss. Wien., 

 math.-naturw. CI., 26:241-278; 4 pi. 



WlLLEMOES-SUHM, R. VON 



1873. Helminthologische Notizen III. (II Uber den Bau und den Embryo des Mono- 

 stomum faba Brs.) Zeit. wiss. Zool., 23:332-335; 1 fig. 

 Zeder, J.'G. H. 



1800. Erster Nachtrag zur Naturgeschichte der Eingeweidewurmer, mit Zufassen und 

 Anmerkungen herausgegeben. Leipzig. 320 pp. 



1803. Anleitung zur Naturgeschichte der Eingeweidewurmer. Bamberg. 432 pp. 



