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1 American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024
Imbricata-type cercariae from Hydrobia salsa, a brackish-water, prosobranch snail taken near Woods Hole, Massachusetts, emerge shortly before noon, are photopositive and encyst after swimming for a few minutes to three to four hours. Metacercariae were fed to chicks and domestic ducklings and developed to mature worms after about two weeks in the bursae Fabricii of these birds. Adult and larval stages are described and figured. The worms belong in the family Notocotylidae and are assigned to the genus, Uniserialis Beverley-Burton, 1958. Systematic problems of genera in the family are discussed.
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