In the course of an extensive parasitological examination of Indian food fishes the author recovered, amongst others, six specimens of an interesting trematode from the gut of a fish examined at Karachi in June 1936. The trematode, though obviously belonging to the family Allocreadiidae, represents a new genus, Horatrema, and a new subfamily, Horatrematinae. This new genus forms a connecting link between Cymbephallus Linton, in Manter, 1934, and Parva-creadium Manter, 1940, of the subfamily Allocreadiinae, and the type genus Notoporus of the family Notoporidae Yamaguti, 1938. It will be appreciated from the systematic discussion at the end of the paper that the taxonomic status of the family Notoporidae is untenable, and it is, therefore, reduced to the rank of a subfamily, Notoporinae, under the family Allocreadiidae. Further, in view of the presence of a cirrus-sac in Notoporus trachuri Yamaguti, 1938, it has been considered necessary to assign it to a new genus, Neonotoporus