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have compared many of them obtained from a large Number of frogs with specimens of typical Drepanidium preparations Supplied by the London School of Tropical Medicine, and found them to correspond in Every respect – vide figure II-VI. These parasites therefore differed from the majority of the forms met with in the Edible frog-forms which I had up until recently distinguished as far as possible as the Dactylosoma and the Drepanidium, although Similar large parasites were found, but which were regarded as part of the Drepanidium cycle of development. I therefore suspected that the parasite found in the rock frog - a typical so-called Drepanidium - was something different from the type usually found in the Edible frog, and in order to obtain more definite information on the question, I attempted to cultivate or preserve the parasites alive outside the body in some form of culture medium.