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1 The American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024
The account of Mme. Kulachkova (1954) on the life-history of Paramonostomum alvealtum is confirmed. The asexual generations and larval stages of both Paramonostomum alveatum and Paramonostomum parvum occur in the prosobranchiate snail, Hydrobia salsa, found in brackish-water ponds near Woods Hole Massachusetts. Sexually mature worms have been obtained by feeding metacercariae to day-old chicks and laboratory-reared eider and domestic ducklings. Adult and larval stages of both species are described and figured. Problems of specific identity in the genus Paramonostomum are discussed.
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