134 KANSAS UNIVERSITY SCIENCE BULLETIN. 



long. Tests two, slightly posterior to middle of body, behind 

 ovary and acetabulum. Ovary partly behind and partly to the 

 right of acetabulum. No Laurer's canal or reccptacidum semi- 

 nis present. Yolk glands lateral, extending over middle third 

 of body. Genital pore near left edge of body, near oral sucker. 

 Cirrus-sac long and lying diagonally across body. Uterus very 

 voluminous. Egg measures .045 millimeter by .019 millimeter. 

 Parasite in the mouth of Ancistrodon contortrix. 



BIBLIOGRAPHY. 



Pratt, H. S. 1903. Descriptions of four distomes. Mark Anniversary 



volume, pp. 23-39. 

 Pratt, H. S. 1902. Synopsis of North American invertebrates: the 



trematodes, part 2. American Naturalist, vol. 36, pp. 887 ff. 

 Stiles, Ch. W., and A. Hassall. 1908. Index catalogue of medical and 



veterinary zoology. Bull. 37, Hygienic Laboratory, U. S. Public 



Health and Marine Hospital Service, Wash., p. 358. 



