Dicrocælium lanceatum (Stiles and Hassall, 1896)
Synonym.—Fasciola lanceolata.
History.—D. lanceatum was found by Buchholz in the gall-bladder of man in Germany, and has since been noted in Egypt and Italy. It is found commonly in bile-ducts of animals, especially herbivora, in Europe, Africa, and America.
The parasite.—D. lanceatum is a small fluke 8-10 mm. in length by 1·5-2·51 mm. in breadth. It is attenuated anteriorly, and the widest point is just posterior to the yolk-glands. The intestine bifurcates just in front of the genital pore. The testes lie behind the ventral sucker. The ovary
Fig. 194.—Ovum of Fasciolopsis buski, x 250. (Photograph by Dr. J. Bell.)
lies behind the posterior testis; there are a receptaculum seminis and a Laurer's canal. The yolk glands lie in the lateral portion of the middle fifth of the body. The eggs are thick-shelled, yellowish-brown in colour, and measure 38-45 μ by 22-30 μ. Nothing is known of the life-history of the parasite.
Heterophyes heterophyes (Bilh. v. Sieb., 1852)
Synonyms.—Distomum heterophyes; Dicrocælium heterophyes; Distoma heterophyes; Heterophyes ægyptiaca; Mesogonimus heterophyes; Cœnogonimus heterophyes; Cotylogonimus heterophyes.
History.—Heterophyes heterophyes was discovered in 1851, in Cairo, by Bilharz at the post-mortem of a child.
