Material was studied in rediae of 3 generations. The germinal cells are in groups of 2-5 free in the body cavity of the rediae. In very small redial embryos only the germinal cell groups may be present. In the older rediae they are mixed with the developing embryos. Only occasionally were single free germinal cells seen. It is postulated that these germinal cell groups must be dividing very rapidly to produce the large numbers of embryos that develop in the rediae of this sp. It is estimated that one infected snail might contain as many as half a million cercarial embryos, and that during the life of a single infection several millions of cercariae would be produced. It is suggested that the germinal cell groups of Clinostomum are the prototypes of the complex germinal masses of the strigeids.