In previous papers by the author several types of traps of Utricularia have been described; in the present the trap of Biovularia (very closely akin to Utricularia) is described and found to be a distinct type, combining in itself characters of the two previously known, described traps of the types vulgaris and purpurea. In the species U. tubulata v. Muel., which is a freely floating form not suspected previously of having a trap of structure other than that of U. vulgaris, it is shown that it conforms with that of the Australasian "land" species U. manziesii, dichotoma, etc. U. tubulata is an inhabitant of N. Queensland also.In place of the rather easily accepted idea, expressed even by Goebel (1) that the floating forms are all alike, we now know of three distinct types, represented by the species, as types of their groups, U. vulgaris, U. purpurea and V. tubulata.