The Fasciola (Distoma) Hepaticum, or liver fluke, is from 15 to 35 mm. long and 6 to 20 in width. Is pointed bluntly at each end and has two suckers, one at the head, the other on the ventral surface. Between the two suckers is the genital pore. The eggs are oval, 0.14 mm. in length, and provided with a lid at one end. Is hermaphroditic, the genital pore acting as a common opening for both sets of sexual organs. Multiplication takes place by the union of two parasites, each acting as both male and female. The adult parasite usually inhabits the bile-ducts of sheep, sometimes of man, in large numbers. It may obstruct the biliary ducts, giving rise to congestion and enlargement of the liver with later on degeneration and cystic formation. A water snail may be the intermediate host.