The first British records of Rhizopoda and Heliozoa were contained in a privately-printed volume (Brightwell, 1848). The book comprised records and drawings of infusoria found by Brightwell in Norfolk, amongst which was the description of a species of Difflugia, tentatively identified as D. globulosa Dujardin. The only other records of Difflugia in the eastern counties of England are contained in Cash & Hopkinson (1909), otherwise the region has been neglected. The present paper is part of a series dealing with species belonging to the genus Difflugia, and is concerned with spherical or ovoid specimens which were isolated from a sample collected at Woodbastwick Fen, Norfolk. Three species of Difflugia were abundant in the sample, namely, D. gramen Penard, 1902; D. lobostoma Leidy, 1879 and/). tuberculata (Wallich, 1864) whilst two, D. achlora (Penard, 1902) and D. wailsei nom. nov. were represented by only a few specimens. The opportunity has also been taken to describe another member of the family Difflugiidae, that is Cucurbitella mespiliformis Penard, 1902, which was present in the same sample.