POLYGYRIDAE - Mesodon

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Mesodon andrewsae Binney 1879, ( 25 ) U.S.A.,

Mesodon andrewsae normalis (Pilsbry 1900), ( 25 ) U.S.A.,

Mesodon appressus (Say 1821), ( 18 ) U.S.A.,

Mesodon clausus (Say 1821), ( 15 ) U.S.A.,

Mesodon elevatus (Say 1821), ( 24 ) U.S.A.,

Mesodon inflectus (Say 1821), ( 10 ) U.S.A.,

Mesodon mitchellianus (Lea 1839), ( 17 ) U.S.A.,

Mesodon (Patera) pennsylvanicus (Greene 1827), ( 19 ) U.S.A.,

Mesodon (Patera) perigrapta (Pilsbry 1894), ( ) U.S.A.,

Mesodon sargentianus (Johnson & Pilsbry 1892), ( 25 ) U.S.A.,

Mesodon thyroidus (Say 1816), ( 24 ) U.S.A. E.,

Mesodon zelatus Binney 1837, ( 28 ) U.S.A.,