Abstract
There is still some difference of opinion as to the classification of what Rudolphi in 1801 called the Amphistomata. Fischoeder (1901—4) regarded all “Amphistomes” as belonging to a single family, the Paramphistomidae. Stiles & Goldberger (1910) proposed the elevation of the group to the status of a superfamily, the Paramphistomoidea, comprising three families, Paramphistomidae, Gastrothylacidae and Gastrodiscidae. Braun (1911), Odhner (1911), Looss (1912) and Stunkard (1925) have maintained Fischoeder's view; Maplestone (1923) and Travassos (1934) have preferred that of Stiles and Goldberger.