The Paragonimus Westermanii (Distoma Pulmonale) is a form that has quite frequently been found in Japan and China.

Is 8 to 10 mm. long, 5 to 6 mm. wide. Resembles quite closely the liver fluke.

Is found in the lungs, usually near the periphery of a cavity. These cavities contain a muco-purulent liquid in which are found many eggs.