Distoma hepaticum, or Fasciola hepatica of liver-rot in sheep, occurs much more rarely in man. Found as flattened leaf-like worms, one-half to three-quarters of an inch long, lying curled up in the bile ducts and gall bladder. When flattened out the D. hepaticum is broader at the anterior than at the posterior end, but is prolonged into a narrow proboscis in front.