This has been especially the case with the Flagellata, the Proteomyxa, and the Mycetozoa.
Lang distinguishes "lobopodia," "filopodia," and "pseudopodia" according to their form,—blunt, thread-like, or anastomosing. In some cases the protoplasm shows a gliding motion as a whole without any distinct pseudopodium, as in Amoeba limax (Fig. 1, p. [5]), and a pseudopodium may pass into a thin, active flagellum, which is, however, glutinous and serves for the capture of prey: such often occurs in the Lobosa Podostoma and Arcuothrix, which are possibly two names for one species or at least one genus; and in many cases a slender pseudopodium may be waved freely.
See Schewiakoff, "Ueb. d. Geograph. Verbreitung d. Süsswasserprotozoen," in Mém. Acad. St. Pétersb. ser. 7, xli. 1893, No. 8. His views apply to most minute aquatic organisms—Animal, Vegetable, or Protistic.
See E. R. Lankester, art. "Protozoa" in Encycl. Brit. 9th ed. (1885), reprinted with additions in "Zoological Articles." We cannot accept his primary division into Corticata and Gymnomyxa, which would split up the Flagellata and mark off the Gregarines from the other Sporozoa.
On this ground I have referred Paramoeba, Greeff, to the Cryptomonadineae.