The summer of 1916-17, with its alternate rain and shine at Lismore, was highly favourable to every form of pond- and swamp-life, and among a host of interesting organisms that came to light, was a varied assortment of Rhizopods. I thought it a good opportunity, therefore, to write up this group, particularly as I had reason to believe that the species were to be found in considerable variety in my gatherings. A microscopical survey of the latter was accordingly made, with very satisfactory results. Samples.—Out of about 340 gatherings, not made for the collection of Rhizopods, but principally for Desmidiaceæ and Protococcaceæ, 90 were found to contain tests of the Rhizopoda to a greater or less extent; 43 of these were from Sydney, and 47 from Lismore. The localities and numbers of the samples are given in the notes on the various species, but as very few gatherings are out of Sphagnum (the chief haunt of the Rhizopoda), a note here on the character of the various habitats may be useful.