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Biological Notes on Marisa cornuarietis, A Predator of Australorbis glabratus, The Snail Intermediate Host Of Schistosomiasis in Puerto Rico¹

The omnivorous and voracious habits of the large ampullarid snail Marisa cornuarietis are the basis of its predation and competitive action against Australorbis glabratus in Puerto Rico. Field observations have been made on the biology of Marisa in comparison with that of the schistosome vectorial species.

¹ Contribution of the Communicable Disease Center, Bureau of State Services U. S. Department of Health, Education and Welfare, and the Department of Health, Commonwealth of Puerto Rico.

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